Thirty-five U.S. Senate seats, including two in special elections, were up for election on November 6, 2018. Heading into the election, the Republican Party held a 51-seat majority in the chamber. Democrats held 47 seats, and the remaining two seats were held by independents who caucus with the Democratic Party.

Five incumbents—four Democrats and one Republican—lost their seats in 2018. Following the 2018 midterm elections, the Republican Party expanded their majority by two and controlled 53 seats in the chamber, Democrats controlled 45 seats, and independents in Maine and Vermont who caucus with the Democrats held two seats.

On this page, Ballotpedia compiled the following resources about the U.S. Senate elections:

Election results in all 35 U.S. Senate races;
Analysis of partisan control of the U.S. Senate following the election;
Analysis of whether 2018 was a wave election;
The partisan breakdown of the U.S. Senate before and after the election;
A list of all U.S. Senate races and battlegrounds in 2018;
Public opinion polls for the battleground races;
Race ratings from election forecasters;
Information about incumbents not running for re-election;
Endorsements from national figures like Presidents Barack Obama (D) and Donald Trump (R); and
Analaysis of federal elections.

This page focuses mainly on general elections. For more in-depth information on the Democratic and Republican primaries by state, see the following pages.

United States Senate Democratic Party primaries, 2018
United States Senate Republican Party primaries, 2018

2018 election analysis and context

Democrats were defending 26 of the 35 seats up for re-election, making it difficult for them to add the two seats necessary to wrest majority control from the Republicans. This situation occurs occasionally. To read more about how a disproportion in the number of seats up for election impacted partisan risk in the 2016 elections, click here.

Republicans won Democratic seats in Florida, Indiana, Missouri, and North Dakota, while Democrats won Republican seats in Arizona and Nevada. Republicans will hold a 53-47 majority in the U.S. Senate in the 116th Congress.

Incumbents ran for re-election in 32 of 35 races. Five incumbent U.S. senators were defeated—four Democrats and one Republican. Democrats had to defend seats in 10 states that supported Donald Trump (R) over Hillary Clinton (D) in 2016, while Republicans had to defend just one seat in a state won by Clinton. All five of the incumbents who lost in 2018 were from those 11 states:

North Dakota: U.S. Rep. Kevin Cramer (R) defeated incumbent Sen. Heidi Heitkamp (D). Trump won the state by 36 points in 2016.

Missouri: Incumbent U.S. Sen. Claire McCaskill (D) lost to Missouri Attorney General Josh Hawley (R). Trump won Missouri by 18.5 percentage points in 2016. McCaskill's 2012 re-election was the last time a Democrat won a statewide election in Missouri.

Indiana: Incumbent U.S. Sen. Joe Donnelly (D) lost to former state Rep. Mike Braun (R). Trump won Indiana by 19 points in 2016.

Florida: Incumbent U.S. Sen. Bill Nelson (D) lost to term-limited Gov. Rick Scott (R). Trump won Florida by 1.2 percentage points in 2016.

Nevada: Incumbent U.S. Sen Dean Heller (R) lost to U.S. Rep. Jacky Rosen (D). Clinton won Nevada by 2.4 percentage points in 2016.

Election results

This table shows the results of the U.S. Senate elections on November 6, 2018. Of the 35 seats up for election, Democrats won 22 seats, Republicans won 11 seats, and two seats were won by independents who caucus with the Democrats. In 2018, Republicans had a net gain of two seats and controlled 53 seats at the beginning of the 116th Congress.

Results of United States Senate elections, 2018
State	Incumbent	Winner	Partisan change	Incumbent status
Arizona	Jeff Flake	Kyrsten Sinema	Yes	Incumbent didn't seek re-election
California	Dianne Feinstein	Dianne Feinstein	No	Won
Connecticut	Chris Murphy	Chris Murphy	No	Won
Delaware	Tom Carper	Tom Carper	No	Won
Florida	Bill Nelson	Rick Scott	Yes	Lost
Hawaii	Mazie Hirono	Mazie Hirono	No	Won
Indiana	Joe Donnelly	Mike Braun	Yes	Lost
Massachusetts	Elizabeth Warren	Elizabeth Warren	No	Won
Maryland	Ben Cardin	Ben Cardin	No	Won
Maine	Angus King	Angus King	No	Won
Michigan	Debbie Stabenow	Debbie Stabenow	No	Won
Minnesota	Amy Klobuchar	Amy Klobuchar	No	Won
Minnesota (special)	Tina Smith	Tina Smith	No	Won
Missouri	Claire McCaskill	Josh Hawley	Yes	Lost
Mississippi	Roger Wicker	Roger Wicker	No	Won
Mississippi (special)	Cindy Hyde-Smith	Cindy Hyde-Smith	No	Won
Montana	Jon Tester	Jon Tester	No	Won
North Dakota	Heidi Heitkamp	Kevin Cramer	Yes	Lost
Nebraska	Deb Fischer	Deb Fischer	No	Won
New Jersey	Bob Menendez	Bob Menendez	No	Won
New Mexico	Martin Heinrich	Martin Heinrich	No	Won
Nevada	Dean Heller	Jacky Rosen	Yes	Lost
New York	Kirsten Gillibrand	Kirsten Gillibrand	No	Won
Ohio	Sherrod Brown	Sherrod Brown	No	Won
Pennsylvania	Bob Casey	Bob Casey	No	Won
Rhode Island	Sheldon Whitehouse	Sheldon Whitehouse	No	Won
Tennessee	Bob Corker	Marsha Blackburn	No	Incumbent didn't seek re-election
Texas	Ted Cruz	Ted Cruz	No	Won
Utah	Orrin Hatch	Mitt Romney	No	Incumbent didn't seek re-election
Virginia	Tim Kaine	Tim Kaine	No	Won
Vermont	Bernie Sanders	Bernie Sanders	No	Won
Washington	Maria Cantwell	Maria Cantwell	No	Won
Wisconsin	Tammy Baldwin	Tammy Baldwin	No	Won
West Virginia	Joe Manchin	Joe Manchin	No	Won
Wyoming	John Barrasso	John Barrasso	No	Won

Margin of victory

See also: Margin of victory analysis for the 2018 congressional elections

The margin of victory for each race is calculated by examining the percentage difference between the two candidates who received the most votes. If the race was uncontested, the margin of victory is listed as 100 percent. Some quick facts:

The average margin of victory was 16.8 percent. This is below the 22.1 percent average in 2016 and the 22.6 percent average in 2014.
On average, Republicans won by smaller margins than Democrats. The average MOV for victorious Democrats was 16.8 percent, while Republican victors averaged a MOV of 14.3 percent.
The closest race was in Florida, where challenger Rick Scott (R) defeated incumbent Bill Nelson (D) by 0.15 percent of the vote.

Click [show] to view a list of U.S. Senate elections sorted by margin of victory

U.S. Senate margins of victory, 2018
District	Winner	Winner votes (%)	Runner-up	Runner-up votes (%)	Total votes	Margin of victory
U.S. Senate, Florida	Rick Scott	50.05%	Bill Nelson	49.93%	8,190,005	0.12%
U.S. Senate, Arizona	Kyrsten Sinema	49.96%	Martha McSally	47.61%	2,384,308	2.34%
U.S. Senate, Texas	Ted Cruz	50.89%	Beto O'Rourke	48.33%	8,371,655	2.57%
U.S. Senate, West Virginia	Joe Manchin III	49.57%	Patrick Morrisey	46.26%	586,034	3.31%
U.S. Senate, Montana	Jon Tester	50.33%	Matt Rosendale	46.78%	504,384	3.55%
U.S. Senate, Nevada	Jacky Rosen	50.41%	Dean Heller	45.38%	972,132	5.03%
U.S. Senate, Missouri	Josh Hawley	51.38%	Claire McCaskill	45.57%	2,442,289	5.81%
U.S. Senate, Indiana	Mike Braun	50.73%	Joe Donnelly	44.84%	2,282,565	5.89%
U.S. Senate, Michigan	Debbie Stabenow	52.26%	John James	45.76%	4,237,271	6.51%
U.S. Senate, Ohio	Sherrod Brown	53.41%	Jim Renacci	46.57%	4,410,898	6.85%
U.S. Senate, California	Dianne Feinstein	54.16%	Kevin de León	45.84%	11,113,364	8.33%
U.S. Senate, Tennessee	Marsha Blackburn	54.71%	Phil Bredesen	43.92%	2,243,740	10.79%
U.S. Senate, Wisconsin	Tammy Baldwin	55.42%	Leah Vukmir	44.58%	2,657,841	10.84%
U.S. Senate, North Dakota	Kevin Cramer	55.11%	Heidi Heitkamp	44.27%	326,138	10.84%
U.S. Senate, New Jersey	Bob Menendez	54.01%	Bob Hugin	42.83%	3,169,310	11.18%
U.S. Senate, Pennsylvania	Bob Casey, Jr.	55.74%	Lou Barletta	42.62%	5,009,400	13.13%
U.S. Senate, Virginia	Tim Kaine	57.00%	Corey Stewart	41.01%	3,351,373	16.00%
U.S. Senate, Washington	Maria Cantwell	58.43%	Susan Hutchinson	41.57%	3,086,168	16.87%
U.S. Senate, Mississippi	Roger Wicker	58.49%	David Baria	39.47%	936,215	19.02%
U.S. Senate, Nebraska	Deb Fischer	57.69%	Jane Raybould	38.62%	698,883	19.06%
U.S. Senate, Maine	Angus King	54.31%	Eric Brakey	35.23%	634,409	19.08%
U.S. Senate, Connecticut	Chris Murphy	59.53%	Matthew Corey	39.35%	1,386,840	20.18%
U.S. Senate, Delaware	Tom Carper	59.95%	Robert Arlett	37.82%	362,592	22.13%
U.S. Senate, Rhode Island	Sheldon Whitehouse	61.44%	Robert Flanders Jr.	38.33%	376,738	23.11%
U.S. Senate, New Mexico	Martin Heinrich	54.09%	Mick Rich	30.53%	697,012	23.56%
U.S. Senate, Minnesota	Amy Klobuchar	60.31%	Jim Newberger	36.21%	2,596,879	24.10%
U.S. Senate, Massachusetts	Elizabeth Warren	60.34%	Geoff Diehl	36.17%	2,707,090	24.16%
U.S. Senate, Utah	Mitt Romney	62.59%	Jenny Wilson	30.91%	1,062,897	31.68%
U.S. Senate, New York	Kirsten Gillibrand	67.00%	Chele Farley	33.00%	6,055,151	34.00%
U.S. Senate, Maryland	Ben Cardin	64.86%	Tony Campbell	30.31%	2,299,889	34.55%
U.S. Senate, Wyoming	John Barrasso	66.96%	Gary Trauner	30.10%	203,420	36.86%
U.S. Senate, Vermont	Bernie Sanders	67.32%	Lawrence Zupan	27.39%	272,624	39.93%
U.S. Senate, Hawaii	Mazie Hirono	71.15%	Ron Curtis	28.85%	388,351	42.30%

Pre-election analysis

The Democratic Party faced greater partisan risk in regular Senate elections in 2018, as they were defending 26 seats while Republicans were only defending nine. Additionally, the Democratic Party had to defend seats in 10 states that supported Donald Trump (R) over Hillary Clinton (D) in the 2016 presidential election. Republicans defended just one Senate seat in a state won by Clinton—Nevada.

Three incumbent senators, all Republicans, did not seek re-election in 2018: Sen. Bob Corker (Tenn.), Sen. Jeff Flake (Ariz.), and Sen. Orrin Hatch (Utah).

Those elected to the U.S. Senate in the 33 regular elections on November 6, 2018, began their six-year terms on January 3, 2019.

Partisan breakdown

In the 2016 elections, the Republican Party lost two seats but maintained its Senate majority. Heading into the 2018 election, the Republican Party held the majority in the U.S. Senate with 51 Senate seats, Democrats had 47 Senate seats, and two seats were held by independents who caused with the Democratic Party. In the 2018 midterm elections, the Republican Party expanded their majority by two seats.

U.S. Senate Partisan Breakdown
Party		As of November 5, 2018	After the 2018 Election
	Democratic Party	47	45
	Republican Party	51	53
	Independent	2	2
	Vacancies	0	0
Total		100	100

Click here to learn more about the history of partisan control of the U.S. Senate from 2000 to 2018.

From 2000 to 2018, partisan control of the U.S. Senate changed four times. Republicans controlled the chamber entering 2000. Democrats temporarily took a one-vote majority in the Senate after Vermont Sen. Jim Jeffords decided to leave the Republican Party, serve as an independent, and caucus with the Democrats in 2001. Shortly before the 2002 midterm election, however, Minnesota Sen. Paul Wellstone (D) was killed in a plane crash. His replacement, former Vice President Walter Mondale (D), was defeated by Norm Coleman (R). Following the midterm election, Coleman became the 51st Republican senator.^[1] In 2005 and 2006, Republicans reached a high of 55 seats compared to the Democrats' 45.

Republicans lost control of the Senate in 2007 following the previous year's midterm election. Democrats won a 51-49 majority that year, which grew to a 59-41 split in 2010. The Senate changed hands again following the 2014 midterm election, and Republicans held a 54-46 majority in 2015 and 2016. This majority fell to a 52-48 split in 2017, and with the special election victory of Alabama Sen. Doug Jones (D) shrinking the Republican majority to 51-49 in 2018, partisan control of the Senate was at risk of changing as a result of the 2018 elections.

If partisan control of the chamber did change in part because of Jones' win, it was another instance of the Senate majority shifting due to unexpected circumstances. A historical example of this would be 1953, when the Republican majority in the Senate shrank to 48-47 after Oregon Sen. Wayne Morse left the Republican Party to become an independent. Nine senators died from 1953 to 1955. When Ohio Sen. Robert Taft (R) died during the summer of 1953, a Democrat was appointed to replace him, which gave the Democratic Party a one-vote majority. The following summer, Wyoming Sen. Lester Hunt (D) committed suicide and a Republican was appointed to replace him. This flipped the majority back into Republican control.^[1]

Battlegrounds

Including the two special elections, there were 24 Democratic seats, nine Republican seats, and two seats held by independents up for election in 2018. The Democratic Party needed to pick up two seats in the Senate in 2018 to regain the majority they lost in 2014. This was unlikely as there were so few Republican seats up for election.^[2]

Click here for more of Ballotpedia's coverage of U.S. Senate battleground races in 2018.

The following map displays which Senate seats were up for election in 2018 and identifies those races that were considered battleground elections. Mouse over a state for more detailed information.

Results of United States Senate battlegrounds, 2018
State	Incumbent	Winner	Partisan change	Incumbent status
Arizona	Jeff Flake	Kyrsten Sinema	Yes	Incumbent didn't seek re-election
California	Dianne Feinstein	Dianne Feinstein	No	Won
Florida	Bill Nelson	Rick Scott	Yes	Lost
Indiana	Joe Donnelly	Mike Braun	Yes	Lost
Minnesota (special)	Tina Smith	Tina Smith	No	Won
Missouri	Claire McCaskill	Josh Hawley	Yes	Lost
Mississippi (special)	Cindy Hyde-Smith	Cindy Hyde-Smith	No	Won
Montana	Jon Tester	Jon Tester	No	Won
North Dakota	Heidi Heitkamp	Kevin Cramer	Yes	Lost
New Jersey	Bob Menendez	Bob Menendez	No	Won
New Mexico	Martin Heinrich	Martin Heinrich	No	Won
Nevada	Dean Heller	Jacky Rosen	Yes	Lost
Ohio	Sherrod Brown	Sherrod Brown	No	Won
Tennessee	Bob Corker	Marsha Blackburn	No	Incumbent didn't seek re-election
Texas	Ted Cruz	Ted Cruz	No	Won
West Virginia	Joe Manchin	Joe Manchin	No	Won

List of all U.S. Senate elections in 2018

Polls

See also: Ballotpedia's approach to covering polls

The following tabs feature the most recent polls in battleground Senate races in 2018.

Arizona

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U.S. Senate election in Arizona, General election: Sinema vs. McSally
Poll	Poll sponsor	Sinema	McSally	Other/Undecided	Margin of error	Sample size

ABC 15/OH Predictive Insights November 2-3, 2018	N/A	48%	49%	3%	+/-3.9	631
Trafalgar Group October 30-November 1, 2018	N/A	50%	47%	3%	+/-2.1	2,166
Vox Populi Polling October 27-30, 2018	N/A	52%	48%	0%	+/-3.7	677
Fox News October 27-29, 2018	N/A	46%	46%	8%	+/-3.5	643
CNN/SSRS October 24-29, 2018	N/A	51%	47%	2%	+/-4.4	702
HighGround Public Affairs October 26-28, 2018	N/A	45%	47%	9%	+/-4.9	400
NBC News/Marist October 23-27, 2018	N/A	50%	44%	6%	+/-5.4	506
Reuters/Ipsos/UVA Center for Politics September 17-26, 2018	N/A	46%	48%	6%	+/-4.0	799
ABC 15/OH Predictive Insights October 22-23, 2018	N/A	45%	52%	3%	+/-4.0	600
AVERAGES		48.11%	47.56%	4.44%	+/-3.99	791.56
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Click [show] to see older poll results

U.S. Senate election in Arizona, September 10-October 26, 2018
Poll	Poll sponsor	Sinema	McSally	Other/Undecided	Margin of error	Sample size

CBS News/YouGov October 23-26, 2018	N/A	47%	44%	9%	+/-4.1	972
The New York Times/Siena College October 15-19, 2018	N/A	46%	48%	6%	+/-4.2	606
Data Orbital October 16-17, 2018	N/A	47%	41%	12%	+/-4.0	600
CBS News/YouGov October 2-5, 2018	N/A	47%	44%	9%	+/-3.6	898
OH Predictive Insights/ABC15 Arizona October 1-2, 2018	N/A	41%	47%	12%	+/-4.0	600
Fox News Poll September 27-October 2, 2018	N/A	47%	45%	8%	+/-3.5	716
Suffolk University September 27-30, 2018	N/A	45%	42%	13%	+/-4.4	500
Latino Decisions September 10-25, 2018	Arizona State University	47%	41%	11%	+/-3.5	775
AVERAGES		45.88%	44%	10%	+/-3.91	708.38
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

U.S. Senate election in Arizona, March 15-September 21, 2018
Poll	Kyrsten Sinema (D)	Martha McSally (R)	Other/Undecided	Margin of Error	Sample Size

Emerson September 19-21, 2018	45%	39%	17%	+/-4.4	650
NBC News September 16-20, 2018	48%	45%	7%	+/-4.7	564
CNN/SSRS September 11-15, 2018	50%	43%	7%	+/-4.3	761
Reuters/Ipsos/UVA Center for Politics September 5-14, 2018	47%	44%	9%	+/-3.5	1,016
Fox News September 8-11, 2018	47%	44%	8%	+/-3.5	710
ABC 15/OH Predictive Insights September 5-6, 2018	46%	49%	5%	+/-4.0	597
Gravis Marketing September 5-7, 2018	48%	49%	3%	+/-3.3	882
Data Orbital September 4-6, 2018	44%	40%	16%	+/-4.2	550
ABC 15/OH Predictive Insights July 23-25, 2018	48%	44%	8%	+/-4.0	600
Gravis Marketing June 27-July 2, 2018	43%	39%	18%	+/-3.2	925
Emerson June 21-22, 2018	40%	32%	28%	+/-4.0	650
NBC News/Marist College June 17-21, 2018	49%	38%	13%	+/-4.5	839
Axios/SurveyMonkey April 2-23, 2018	51%	42%	7%	+/-4.0	1,667
Public Policy Polling March 15-16, 2018	46%	41%	13%	+/-4.2	547
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

California

General election

U.S. Senate election in California, General election
Poll	Feinstein (D)	De León (D)	Undecided/Other	Margin of Error	Sample Size

SurveyUSA November 1-2, 2018	50%	36%	14%	+/-4.7	1,200
Berkeley IGS October 19-26, 2018	45%	36%	19%	+/-4.0	1,339
Probolsky Research October 25-30, 2018	41%	35%	24%	+/-3.3	900
Public Policy Institute of California October 12-21, 2018	43%	27%	31%	+/-3.3	1,704
Probolsky Research August 29-September 2, 2018	37%	29%	34%	+/-3.3	900
The Public Policy Institute of California July 8-17, 2018	46%	24%	9%	+/-3.4	1,711
LA Times June 6-17, 2018	36%	18%	46%	+/-4.0	893
Probolsky Research April 16-18, 2018	38%	27%	35%	+/-3.3	900
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

Click [show] to see poll results from the top-two primary

Top-two primary

U.S. Senate election in California, Feinstein, de León, and Bradley
Poll	Feinstein (D)	De León (D)	Bradley (R)	Others	Undecided	Margin of Error	Sample Size

Berkeley-IGS May 22-28, 2018	36%	11%	7%	23%	25%	+/-4.0	2,106
YouGov May 12-24, 2018	36%	11%	6%	24%	23%	+/-4.0	1,113
Berkeley-IGS April 16-22, 2018	28%	11%	10%	14%	37%	+/-3.5	1,738
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

U.S. Senate election in California, Top-two primary
Poll	Feinstein (D)	Schrader (R)	Kalemkarian (D)	Little (R)	De León (D)	Melendez (D)	Others	Undecided	Margin of Error	Sample Size

SurveyUSA March 22-25, 2018	31%	7%	5%	5%	5%	5%	13%	29%	+/-5.0	517
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

U.S. Senate election in California, Top-two primary, Feinstein v. de León
Poll	Feinstein (D)	de León (D)	Others	Undecided or Would not vote	Margin of Error	Sample Size

Public Policy Institute of California March 4-13, 2018	42%	16%	2%	39%	+/-3.4	1,706
Public Policy Institute of California January 21-30, 2018	46%	17%	3%	33%	+/-3.2	1,705
Berkeley IGS Poll December 7-16, 2017	41%	27%	0%	32%	+/-3.8	1,000
Public Policy Institute of California November 10-19, 2017	45%	21%	1%	33%	+/-4.3	1,070
USC Dornsife/Los Angeles Times October 27-Novmber 6, 2017	58%	31%	10%	31%	+/-4.0	949
Sextant Strategies September 2017	34%	18%	33%	15%	+/-3.4	1,197
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

U.S. Senate election in California, Feinstein, Little, De León, Hartson, Melendez, De La Fuente
Poll	Feinstein (D)	Little (R)	De León (D)	Hartson (D)	Melendez (D)	De La Fuente (R)	Other/Undecided	Margin of Error	Sample Size

SurveyUSA April 19-22, 2018	39%	18%	8%	4%	4%	8%	19%	+/-N/A	520
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

Florida

U.S. Senate election in Florida, General election
Poll	Poll sponsor	Nelson	Scott	Undecided/Other	Margin of error	Sample size

St. Pete Polls November 3-4, 2018	FloridaPolitics.com	50%	46%	4%	+/-1.8	3,088
Quinnipiac University October 29-November 4, 2018	N/A	51%	44%	5%	+/-3.5	1,142
St. Pete Polls November 1-2, 2018	FloridaPolitics.com	48%	49%	3%	+/-1.9	2,733
Marist College October 30-November 2, 2018	N/A	50%	46%	4%	+/-5.0	595
Gravis Marketing October 29-November 2, 2018	N/A	48%	46%	6%	+/-3.6	753
AVERAGES		49.4%	46.2%	4.4%	+/-3.16	1,662.2
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Click [show] to see older poll results

U.S. Senate election in Florida, October 17-31, 2018
Poll	Poll sponsor	Nelson	Scott	Undecided/Other	Margin of error	Sample size

St. Pete Polls October 30-31, 2018	FloridaPolitics.com	49%	47%	3%	+/-2.0	2,470
Vox Populi Polling October 27-30, 2018	N/A	50%	50%	0%	+/-3.7	696
Trafalgar Group October 29-30, 2018	N/A	49%	47%	4%	+/-1.9	2,543
Cygnal October 27-29, 2018	N/A	50%	48%	2%	+/-4.4	495
CNN/SSRS October 24-29, 2018	N/A	49%	47%	4%	+/-4.3	781
Suffolk University/USA TODAY October 25-28, 2018	N/A	45%	43%	12%	+/-4.4	500
Reuters/Ipsos/UVA Center for Politics October 17-25, 2018	N/A	49%	44%	4%	+/-3.4	1,069
AVERAGES		48.71%	46.57%	4.14%	+/-3.44	1,222
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

U.S. Senate election in Florida, October 14-27, 2018
Poll	Poll sponsor	Nelson	Scott	Undecided/Other	Margin of error	Sample size

New York Times/Siena College October 23-27, 2018	N/A	48%	44%	8%	+/-4.0	737
CBS News/YouGov October 23-26, 2018	N/A	46%	46%	8%	+/-4.0	991
Florida Atlantic University October 18-21, 2018	N/A	41%	42%	17%	+/-3.6	704
Strategic Research Associates October 16-23, 2018	Gray Television	46%	45%	9%	+/-3.5	800
St. Pete Polls October 20-21, 2018	N/A	48%	49%	3%	+/-2.5	1,575
SurveyUSA/Spectrum News October 18-21, 2018	N/A	49%	41%	10%	+/-5.0	665
Quinipiac University October 17-21, 2018	N/A	52%	46%	2%	+/-3.5	1,161
SSRS October 16-20, 2018	CNN	50%	45%	4%	+/-4.2	759
OnMessage Inc. October 14-18, 2018	N/A	46%	51%	3%	+/-2.1	2,200
AVERAGES		47.33%	45.44%	7.11%	+/-3.6	1,065.78
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

U.S. Senate election in Florida, General election
Poll	Bill Nelson (D)	Rick Scott (R)	Undecided/Other	Margin of Error	Sample Size
NBC News/Marist September 16-20, 2018	48%	45%	7%	+/-4.7	600

Tampa Bay Times September 17-20, 2018	45%	45%	10%	+/-4.0	604
Florida Atlantic University September 13-16, 2018	41%	42%	17%	+/-3.3	850
Reuters/Ipsos/UVA Center for Politics September 5-12, 2018	45%	46%	10%	+/-3.5	1,000
Rasmussen Reports September 10-11, 2018	45%	45%	11%	+/-3.5	800
Quinnipiac August 30-September 3, 2018	49%	49%	2%	+/-4.3	785
Gravis Marketing August 29-30, 2018	47%	47%	6%	+/-2.8	1,225
Florida Atlantic University August 16-20, 2018	39%	45%	16%	+/-3.4	800
Mason-Dixon Polling July 24-25, 2018	44%	47%	9%	+/-4.0	625
Florida Atlantic University July 20-21, 2018	40%	44%	16%	+/-3.4	800
Axios/Survey Monkey June 11-July 2, 2018	46%	49%	5%	+/-5	1,080
CBS News/YouGov June 19-22, 2018	40%	42%	18%	+/-3.5	1,002
NBC/Marist June 17-21, 2018	49%	45%	6%	+/-3.7	1,083
Florida Chamber of Commerce May 25- June 4, 2018	45%	48%	5%	+/-4.0	605
Morning Consult May 29-30, 2018	39%	40%	21%	+/-3.0	1,119
Florida Atlantic University May 4-7, 2018	40%	44%	16%	+/-3.0	1,000
McLaughlin & Associates March 10-13, 2018	46%	47%	6%	+/-3.4	800
Clearview Research March 1-7, 2018	41%	43%	15%	+/-3.6	750
Quinnipiac University February 23-26, 2018	46%	42%	13%	+/-3.6	1,156
Florida Atlantic University February 1-4, 2018	34%	44%	12%	+/-4.7	750
University of North Florida January 29-February 4, 2018	48%	42%	9%	+/-4.7	429
Mason-Dixon Polling Strategy January 30-February 1, 2018	45%	44%	11%	+/-4.0	625
Gravis Marketing November 19-24, 2017	44%	39%	17%	+/-1.3	5,778
St. Leo University November 19-24, 2017	32%	42%	26%	+/-4.5	500
JMC Analytics October 17-19, 2017	44%	44%	12%	+/-4.0	625
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

Indiana

U.S. Senate election in Indiana, Donnelly vs. Braun
Poll	Poll sponsor	Donnelly	Braun	Undecided/Other	Margin of error	Sample size

Anderson Robbins Research (D) and Shaw & Company Research (R) October 27-30, 2018	Fox News	45%	38%	17%	+/-3.5	722
Marist University October 24-28, 2018	NBC News	45%	42%	13%	+/-5.5	496
Cygnal October 26-27, 2018	N/A	46%	49%	5%	+/-4.36	505
YouGov October 23-26, 2018	CBS News	43%	46%	11%	+/-3.7	975
Mason Strategies October 15-20, 2018	IndyPolitics.org	43%	47%	10%	+/-3.9	600
American Viewpoint October 14-17, 2018	Braun campaign	40%	44%	16%	+/-3.0	800
SurveyUSA October 12-16, 2018	Mike Downs Center for Indiana Politics	41%	40%	19%	+/-4.6	1,400
Vox Populi (Republican vs. Democrat only, no undecided option) October 13-15, 2018	N/A	44%	38%	0%	+/-3.5	783
Anderson Robbins Research (D) and Shaw & Company Research (R) September 29-October 2, 2018	Fox News	43%	41%	16%	+/-3.5	695
Ipsos/Reuters/UVA Center for Politics September 12-19, 2018	N/A	46%	43%	11%	+/-3.3	1,181
Anderson Robbins Research (D)/Shaw & Company Research (R) September 8-11, 2018	Fox News	43%	45%	12%	+/-3.5	677
Marist University August 26-29, 2018	NBC News	44%	41%	15%	+/-5.0	576
Trafalgar Group July 31-August 7, 2018	N/A	51%	39%	11%	+/-2.6	1,420
AVERAGES		44.15%	42.54%	12%	+/-3.84	833.08
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Minnesota

Mississippi

U.S. Senate special election in Mississippi, 2018
Poll	Poll sponsor	Hyde-Smith	Espy	McDaniel	Bartee	Undecided/Other	Margin of error	Sample size

NBC News/Marist October 13-18, 2018	N/A	38%	29%	15%	2%	15%	+/-6.1	511
Y'all Politics July 30-31, 2018	N/A	41%	27%	15%	1%	16%	+/-3.5	2,100
AVERAGES		39.5%	28%	15%	1.5%	15.5%	+/-4.8	1,305.5
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Missouri

U.S. Senate election in Missouri, 2018
Poll	Poll sponsor	Josh Hawley (R)	Claire McCaskill (D)	Other/Undecided	Margin of error	Sample size

Trafalgar Group (October 29-November 4, 2018)	N/A	40%	45%	15%	+/-2.3	1,791
Emerson College (November 1-3, 2018)	N/A	49%	46%	5%	+/-3.8	732
Remington Research Group (November 1-2, 2018)	Missouri Scout	47%	47%	6%	+/-2.6	1,424
Marist University (October 30-November 1, 2018)	NBC News	44%	47%	9%	+/-5.2	600
Anderson Robbins Research (D) and Shaw & Company Research (R) (October 27-30, 2018)	Fox News	43%	43%	14%	+/-3.5	741
Cygnal (October 26-27, 2018)	N/A	49%	46%	5%	+/-4.38	501
Remington Research Group (October 24-25, 2018)	Missouri Scout	49%	45%	6%	+/-2.6	1,376
OnMessage Inc. (October 16-18, 2018)	Hawley campaign	49%	42%	9%	+/-3.46	800
Remington Research Group (October 17-18, 2018)	Missouri Scout	47%	46%	7%	+/-2.7	1,215
The Polling Company (October 11-13, 2018)	Citizens United	50%	47%	3%	+/-4.0	600
1st Tuesday Campaigns (October 5-6, 2018)	N/A	44%	42%	14%	+/-3.02	1,052
Reuters/Ipsos/UVA Center for Politics (September 27- October 7, 2018)	N/A	45%	44%	11%	+/-3.0	1,111
McLaughlin & Associates (September 29- October 2, 2018)	Missouri Rising Action	52%	44%	4%	+/-4.0	600
Anderson Robbins Research (D) and Shaw & Company Research (R) (September 29- October 2, 2018)	Fox News	43%	43%	13%	+/-3.5	805
AVERAGES		46.5%	44.79%	8.64%	+/-3.43	953.43
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Click here to see older polls

U.S. Senate election in Missouri, 2018
Poll	Poll sponsor	Josh Hawley (R)	Claire McCaskill (D)	Other/Undecided	Margin of error	Sample size

SRSS Research (September 25- 29, 2018)	CNN	44%	47%	9%	+/-4.3	756
Remington Research (September 26- 27, 2018)	Missouri Scout	48%	46%	6%	+/-2.5	1,555
YouGov (September 10- 14, 2018)	CBS News	45%	45%	10%	+/-3.3	1,104
Trafalgar Group September 11-13, 2018	N/A	47%	44%	8%	+/-2.4	1,724
Anderson Robbins Research (D) and Shaw & Company Research (R) September 8-11, 2018	Fox News	41%	44%	15%	+/-3.5	675
Marist University August 25-28, 2018	NBC News	40%	44%	16%	+/-4.8	568
WPA Intelligence August 12-14, 2018	Club for Growth	48%	41%	11%	+/-4.4	501
TJP Strategies August 8-9, 2018	Missouri Scout	47%	47%	6%	+/-2.3	1,785
Remington Research July 7-8, 2018	The Missouri Times	48%	46%	6%	+/-3.2	1,034
Gravis May 16, 2018	Petersen campaign	50%	43%	7%	+/-3.4	822
OnMessage Inc. April 16-18, 2018	Hawley campaign	46%	47%	7%	+/-4.0	600
Mason-Dixon Poll April 4-6, 2018	N/A	44%	45%	11%	+/-4.0	625
Public Policy Polling January 8-9, 2018	The Majority Institute	44%	45%	11%	+/-3.2	965
Remington Research January 3-4, 2018	Missouri Scout	49%	45%	6%	+/-2.9	1,112
AVERAGES		45.79%	44.93%	9.21%	+/-3.44	987.57
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Montana

United States Senate election in Montana, 2018
Poll	Poll sponsor	Jon Tester (D)	Matt Rosendale (R)	Other/Undecided	Margin of error	Sample size

University of Montana, Big Sky (October 10-18, 2018)	N/A	49%	39%	12%	+/-4.33	533
Montana State University, Billings (October 8-13, 2018)	N/A	47%	38%	15%	+/-4.5	471
Public Policy Polling (September 28, 2018)	Protect Our Care	49%	45%	6%	+/-4.0	594
Axis Research (September 17-19, 2018)	National Republican Senatorial Committee	44%	44%	12%	+/-4.5	480
Beneson Strategy Group (September 6-16, 2018)	AARP	50%	43%	7%	+/-3.0	950
YouGov (September 10- 14, 2018)	CBS News	47%	45%	8%	+/-5.2	543
WPA Intelligence (August 20- 22, 2018)	National Republican Senatorial Committee	45%	47%	8%	+/-4.0	600
Remington Research (July 8 - 10, 2018)	N/A	49%	46%	5%	+/-2.0	2,581
AVERAGES		47.5%	43.38%	9.13%	+/-3.94	844
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Nevada

Throughout September and October 2018, 10 polls found Heller and Rosen tied within the polls' margins of error.

U.S. Senate election in Nevada, Heller (R) v. Rosen (D) v. Hagan (L)
Poll	Poll sponsor	Dean Heller	Jacky Rosen	Tim Hagan	Undecided/None	Margin of error	Sample size

SSRS October 24-29, 2018	CNN	45%	48%	2%	4%	+/-4.8	622
NBC/Marist Sept. 30-Oct. 3, 2018	N/A	44%	42%	8%	6%	+/-5.5	574
SSRS September 25-29, 2018	CNN	43%	47%	4%	5%	+/-4.6	693
AVERAGES		44%	45.67%	4.67%	5%	+/-4.97	629.67
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

U.S. Senate election in Nevada, Heller (R) v. Rosen (D) (with "Other" and "Don't know" options)
Poll	Poll sponsor	Dean Heller	Jacky Rosen	Other	Don't know	Margin of error	Sample size

Ipsos/Reuters/UVA October 12-19, 2018	N/A	47%	41%	8%	4%	+/-3.3	1,137
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

U.S. Senate election in Nevada, Heller (R) v. Rosen (D)
Poll	Poll sponsor	Dean Heller	Jacky Rosen	Undecided/None	Margin of error	Sample size

Emerson College November 1-4, 2018	N/A	45%	49%	4%	+/-3.0	1,197
Public Policy Polling October 15-16, 2018	Protect Our Care	46%	48%	7%	+/-3.9	648
Vox Populi (Democrat vs. Republican only, no undecided option) October 13-15, 2018	N/A	44%	44%	0%	+/-3.7	614
NYT Upshot/Siena College October 8-10, 2018	N/A	47%	45%	7%	+/-4.0	642
NBC/Marist Sept. 30-Oct. 3, 2018	N/A	46%	44%	9%	+/-5.5	574
Ipsos September 7-17, 2018	N/A	46%	43%	8%	+/-3.7	1,039
Gravis September 11-12, 2018	N/A	45%	47%	8%	+/-3.7	700
Public Policy Polling August 20-21, 2018	Protect Our Care	43%	48%	9%	+/-4.3	500
Suffolk University July 24-29, 2018	N/A	41%	40%	9%	+/-4.4	500
AVERAGES		44.78%	45.33%	6.78%	+/-4.02	712.67
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

U.S. Senate election in Nevada, Heller (R) v. Rosen (D) v. Hagan (L) v. Bakari (Independent American) v. Michaels (Independent)
Poll	Dean Heller	Jacky Rosen	Tim Hagan	Kamau Bakari	Barry Michaels	Undecided	Margin of error	Sample size

Suffolk University September 5-10, 2018	41%	42%	2%	2%	2%	9%	+/-4.4	500
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Click [show] to view polling conducted before the June 12, 2018, primary.

U.S. Senate election in Nevada, Heller (R) v. Rosen (D)
Poll	Dean Heller (R)	Jacky Rosen (D)	Undecided	Margin of Error	Sample Size

Public Policy Polling April 30-May 1, 2018	42%	44%	14%	+/-3.9	637
Axios/Survey Monkey April 2-23, 2018	44%	50%	6%	+/-5.0	1,332
Mellman Group April 12-19, 2018	40%	39%	21%	+/-4.0	600
Public Policy Polling March 15-17, 2018	39%	44%	17%	+/-3.7	720
Public Policy Polling June 23-25, 2017	41%	42%	17%	+/-3.9	648
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

Republican primary

U.S. Senate election in Nevada, Republican primary
Poll	Danny Tarkanian	Dean Heller	Undecided	Margin of Error	Sample Size

JMC Analytics October 24-26, 2017	44%	38%	17%	+/-4.4	500
JMC Analytics August 24-25, 2017	39%	31%	31%	+/-3.7	700
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

New Jersey

See also: Ballotpedia's approach to covering polls

U.S. Senate election in New Jersey
Poll	Poll sponsor	Menendez	Hugin	Sabrin	Unsure/Someone else/Wouldn't Vote	Margin of Error	Sample Size

Quinnipiac University (October 29 - November 4, 2018)	N/A	55%	40%	0%	5%	+/-4.0	1,115
Stockton University (October 25-31, 2018)	N/A	51%	39%	3%	6%	+/-4.0	598
Vox Populi Polling (October 27-29, 2018)	N/A	54%	46%	0%	0%	+/-3.4	814
Emerson College (October 24-26, 2018)	N/A	47%	42%	0%	7%	+/-4.0	659
Rutgers University (October 12-19, 2018)	N/A	51%	46%	0%	4%	+/-5.1	496
Note: A "0%" finding means the question was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

Click [show] to see older poll results

U.S. Senate election in New Jersey
Poll	Menendez	Hugin	Sabrin	Unsure/Someone else/Wouldn't Vote	Margin of Error	Sample Size

Monmouth University (October 11-15, 2018)	49%	40%	1%	10%	+/-4.3	527
Quinnipiac University (October 10-16, 2018)	51%	44%	0%	5%	+/-4.3	873
CBS News/YouGov October 2-5, 2018	49%	39%	0%	12%	+/-3.6	704
Quinnipiac University September 15- October 2, 2018	53%	42%	0%	5%	+/-4.1	1,058
Fairleigh Dickinson University September 26-30, 2018	43%	37%	0%	21%	+/-3.9	508
Stockton University September 19-27, 2018	45%	43%	3%	8%	+/-4.3	531
Quinnipiac University Poll August 15-20, 2018	43%	37%	0%	20%	+/-4.6	908
Gravis Marketing/Sabrin (L) Internal Poll August 14-15, 2018	40%	30%	7%	44%	+/-3.6	753
Gravis Marketing July 6-10, 2018	43%	41%	0%	16%	+/-4.1	563
Note: A "0%" finding means the question was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

New Mexico

U.S. Senate election in New Mexico, Heinrich (D) v. Johnson (L) v. Rich (R)
Poll	Poll sponsor	Martin Heinrich	Gary Johnson	Mick Rich	Undecided	Margin of error	Sample size

Research & Polling Inc. Oct. 26-Nov. 1, 2018	Albuquerque Journal	51%	12%	31%	6%	+/-4.7	993
Emerson College October 24-26, 2018	N/A	48%	16%	32%	6%	+/-3.4	936
Research & Polling Inc. September 7-13, 2018	Albuquerque Journal	47%	16%	26%	0%	+/-3.1	966
Emerson College August 17-18, 2018	N/A	39%	21%	11%	30%	+/-4.6	500
AVERAGES		46.25%	16.25%	25%	10.5%	+/-3.95	848.75
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

North Dakota

U.S. Senate election in North Dakota, Cramer (R) v. Heitkamp (D)
Poll	Poll sponsor	Cramer	Heitkamp	Undecided	Margin of error	Sample size

Anderson Robbins Research (D)/Shaw & Company Research (R) October 27-30, 2018	FOX News	51%	42%	4%	+/-3	789
Strategic Research Associates October 12-19, 2018	Gray TV	56%	40%	4%	+/-3.8	650
Anderson Robbins Research (D)/Shaw & Company Research (R) Sept. 28-Oct. 2, 2018	FOX News	53%	41%	3%	+/-3.5	704
Strategic Research Associates September 17-27, 2018	Gray TV	51%	41%	8%	+/-3.8	650
Anderson Robbins Research (D)/Shaw & Company Research (R) September 8-11, 2018	FOX News	48%	44%	6%	+/-3.5	701
Mason-Dixon Polling and Strategy June 13-15, 2018	N/A	48%	44%	8%	+/-4	625
AVERAGES		51.17%	42%	5.5%	+/-3.6	686.5
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Click [show] to view polling conducted before the June 12, 2018, primary.

U.S. Senate election in North Dakota, Campbell (R) v. Heitkamp (D) (hypothetical match-up)
Poll	Tom Campbell (R)	Heidi Heitkamp (D)	Other	Margin of Error	Sample Size

1892 Polling October 11-12, 2017	44%	41%	15%	+/-4.9	500
1892 Polling May 30-June 1, 2017	37%	43%	20%	+/-4.9	500
Note: A "0%" finding means the question was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

U.S. Senate election in North Dakota, Republican primary
Poll	Tom Campbell (R)	Rick Berg (R)	Other candidate(s)	Undecided	Margin of Error	Sample Size

1892 Polling October 11-12, 2017	32%	34%	9%	35%	+/-4.0	400
1892 Polling May 30-June 1, 2017	7%	39%	9%	45%	+/-4.0	400
Note: A "0%" finding means the question was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

Ohio

See also: Ballotpedia's approach to covering polls

United States Senate election in Ohio, 2018
Poll	Poll sponsor	Sherrod Brown (D)	Jim Renacci (R)	Undecided/Other	Margin of error	Sample size

Gravis Marketing (October 29-30, 2018)	N/A	46%	37%	17%	+/-3.5	789
Cygnal (October 30-31, 2018)	N/A	52%	42%	6%	+/-4.4	503
Baldwin Wallace University (October 19-27, 2018)	N/A	51%	32%	17%	+/-3.8	1,051
Suffolk University (October 4-8, 2018)	The Cincinnati Enquirer	54%	36%	10%	+/-4.4	500
Baldwin Wallace University (September 28-October 8, 2018)	N/A	49%	33%	18%	+/-3.5	1,007
AVERAGES		50.4%	36%	13.6%	+/-3.92	770
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Click [show] to see older poll results

United States Senate election in Ohio, 2018
Poll	Sherrod Brown (D)	Jim Renacci (R)	Margin of error	Sample size

Triton Polling (September 18-20, 2018)	52%	42%	5%	+/-3.1	1,003
Baldwin Wallace University (September 5-15, 2018)	49%	32%	19%	+/-3.6	1,048
Politico/Morning Consult (September 2-11, 2018)	47%	31%	+/-2	1,592
NBC/Marist (June 17-22, 2018)	51%	38%	+/-4.4	778
Enquirer/Suffolk University (June 6-11, 2018)	53%	37%	+/-4.4	500
Quinnipiac University (June 7-12, 2018)	51%	34%	+/-3.7	1,082
Fallon Research (May 21-25, 2018)	48%	34%	+/-3.5	800
Baldwin Wallace University (February 28, 2018 - March 9, 2018)	41%	29%	+/-3	1,101
Survey USA (March 16, 2018 - March 20, 2018)	52%	38%	+/-3.5	1,408
AVERAGES	49.33%	35%	+/-3.47	1,034.67
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Tennessee

U.S. Senate in Tennessee, General election
Poll	Phil Bredesen (D)	Marsha Blackburn (R)	Undecided/Other	Margin of Error	Sample Size

East Tennessee State University October 22-29, 2018	44%	44%	12%	+/-4.0	610
SSRS October 24-29, 2018	45%	49%	6%	+/-4.3	764
Anderson Robbins Research and Shaw & Company Research October 27-30, 2018	41%	50%	5%	+/-3.0	850
Marist Poll October 23-27, 2018	46%	51%	4%	+/-4.0	910
Vanderbilt University October 8-13, 2018	44%	43%	12%	+/-4.9	800
Reuters October 4-11, 2018	44%	47%	10%	+/-3.4	1,108
NYT Upshot/Siena College October 7-11, 2018	40%	54%	6%	+/-4.2	593
YouGov October 2-5, 2018	42%	50%	8%	+/-3.4	1,002
Anderson Robbins Research and Shaw & Company Research September 29-October 2, 2018	43%	48%	10%	+/-3.5	806
Triton Polling and Research September 10-12, 2018	45%	48.3%	6.7%	+/-3.0	1,038
SSRS September 11-15, 2018	50%	45%	5%	+/-4.3	723
NBC News/Marist August 25-28, 2018	48%	46%	6%	+/-5.1	538
Gravis August 9-11, 2018	44%	48%	8%	+/-3.9	620
Public Policy Polling July 10-11, 2018	44%	41%	15%	+/-4.1	583
Middle Tennessee State University March 22-29, 2018	45%	35%	20%	+/-4.0	600
Garin-Hart-Yang (commissioned by the Democratic Senatorial Campaign Committee) October 20-22, 2017	46%	41%	13%	+/-4.1	601
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

Texas

U.S. Senate election in Texas, General election: Cruz vs. O'Rourke
Poll	Poll sponsor	Cruz	O'Rourke	Other/Undecided	Margin of error	Sample size

Trafalgar Group November 3-5, 2018	N/A	52%	43%	5%	+/-2.1	2,135
Emerson October 28-30, 2018	N/A	50%	47%	2%	+/-3.7	781
UT Tyler Polling Center October 15-28, 2018	N/A	46%	39%	15%	+/-3.0	1,033
Quinnipiac University October 22-28, 2018	N/A	51%	46%	3%	+/-3.5	1,078
CBS 11/Dixie Strategies October 25-26, 2018	N/A	52%	42%	5%	+/-4.0	588
University of Texas/Texas Tribune October 15-21, 2018	N/A	51%	45%	4%	+/-3.2	927
GBA Strategies October 18-21, 2018	End Citizens United	50%	46%	4%	+/-3.2	1,298
Reuters October 12-18, 2018	N/A	49%	44%	7%	+/-3.2	1,298
CNN/SRSS October 9-13, 2018	N/A	52%	45%	3%	+/-4.5	716
WPA Intelligence October 8-13, 2018	Club for Growth Action	52%	43%	5%	+/-3.5	801
New York Times/Siena College October 8-11, 2018	N/A	51%	43%	6%	+/-3.6	800
Quinnipiac University October 3-9, 2018	N/A	54%	45%	2%	+/-4.4	730
CBS News/YouGov October 2-5, 2018	N/A	50%	44%	6%	+/-4.2	881
Emerson October 1-5, 2018	N/A	47%	42%	11%	+/-4.5	500
AVERAGES		50.5%	43.86%	5.57%	+/-3.61	969
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Click [show] to see older poll results

U.S. Senate election in Texas, General election: Cruz vs. O'Rourke
Poll	Poll sponsor	Ted Cruz (R)	Beto O'Rourke (D)	Other/Undecided	Margin of Error	Sample Size

Public Policy Polling September 19-20, 2018	Protect Our Care	48%	45%	7%	+/-4.0	613
Quinnipiac University September 11-17, 2018	N/A	54%	45%	1%	+/-4.1	807
Reuters/Ipsos/UVA Center for Politics September 6-14, 2018	N/A	45%	47%	8%	+/-4.0	992
CBS 11/Dixie Strategies Poll September 6-7, 2018	N/A	46%	42%	11%	+/-4.3	519
NBC News/Marist August 12-16, 2018	N/A	49%	45%	6%	+/-3.8	759
Public Policy Polling August 2-3, 2018	N/A	46%	42%	12%	+/-3.5	797
Quinnipiac University July 26-31, 2018	N/A	49%	43%	7%	+/-3.5	1,118
Lyceum July 9-26, 2018	N/A	36%	34%	27%	+/-3.45	806
Gravis Marketing July 3-7, 2018	N/A	51%	42%	7%	+/-4.0	602
CBS News/YouGov June 19-22, 2018	N/A	44%	36%	20%	+/-3.6	1,030
University of Texas/Texas Tribune June 8-17, 2018	N/A	41%	36%	22%	+/-2.8	1,200
Greenberg Quinlan Rosner May 20-June 5, 2018	End Citizens United	49%	43%	8%	+/-3.1	1,000
Quinnipiac University May 23-29, 2018	N/A	50%	39%	11%	+/-3.8	961
Public Policy Polling May 21-22, 2018	Giffords	48%	42%	10%	+/-3.3	861
JMC Analytics May 19-21, 2018	Red Metrics Group	47%	40%	13%	+/-4.1	575
Quinnipiac University April 12-17, 2018	N/A	47%	44%	9%	+/-3.6	1,029
Public Policy Polling January 17-18, 2018	End Citizens United	45%	37%	18%	+/-3.6	757
Note: A "0%" finding means the candidate was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

West Virginia

U.S. Senate election in West Virginia, General election (Manchin vs. Morrisey)
Poll	Poll sponsor	Joe Manchin (D)	Patrick Morrisey (R)	Undecided/Other	Margin of Error	Sample Size

Emerson College (October 28-31, 2018)	N/A	47%	42%	11%	+/-3.2	1,013
Research America (October 19-30, 2018)	The Metro News The Dominion Post	45%	40%	16%	+/-4.9	400
Fabrizio, Lee & Associates (October 16-18, 2018)	National Republican Senatorial Committee	42%	44%	15%	+/-4.0	600
PopPolling Research (October 13-15, 2018)	N/A	53%	47%	0%	+/-3.5	789
Strategic Research Associates, LLC (October 12-19, 2018)	Gray Television	52%	36%	12%	+/-3.8	650
Note: A "0%" finding means the question was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

Click [show] to view earlier polls of the general election.

U.S. Senate election in West Virginia, General election (Manchin vs. Morrisey)
Poll	Poll sponsor	Joe Manchin (D)	Patrick Morrisey (R)	Undecided/Other	Margin of Error	Sample Size

The Polling Company (October 11-13, 2018)	Citizens United Political Victory Fund	49%	45%	5%	+/-4.0	600
Public Opinion Strategies (October 7-9, 2018)	National Republican Senatorial Committee and the Morrisey campaign	41%	40%	19%	+/-4.0	600
The Tarrance Group (September 23-25, 2018)	47%	43%	10%	+/-4.1	612
Global Strategy Group (September 19-23, 2018)	48%	36%	16%	+/-4.0	601
Strategic Research Associates, LLC (September 17-26, 2018)	46%	38%	16%	+/-3.8	650
1892 Polling (September 24-25, 2018)	45%	45%	10%	+/-4.4	500
Harper Polling (August 23-26, 2018)	47%	41%	12%	+/-4.0	600
MetroNews Dominion Post (August 16-26, 2018)	46%	38%	16%	+/-4.9	404
Trafalgar Group (July 13-16, 2018)	50%	40%	10%	+/-2.9	1,158
Monmouth University (June 14-19, 2018)	49%	42%	9%	+/-3.8	653
Public Policy Polling (June 12-13, 2018)	49%	42%	9%	+/-3.9	633
Global Strategy Group May 13-16, 2018	50%	42%	8%	+/-4.0	600
WPA Intelligence May 10, 2018	44%	46%	10%	+/-4.9	400
Note: A "0%" finding means the question was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

U.S. Senate election in West Virginia, General election (Manchin, Morrisey, and Blankenship)
Poll	Joe Manchin (D)	Patrick Morrisey (R)	Don Blankenship	Undecided/Other	Margin of Error	Sample Size

Monmouth University (June 14-19, 2018)	48%	39%	4%	8%	+/-3.8	653
Public Policy Polling (June 12-13, 2018)	46%	35%	11%	7%	+/-3.9	633
Note: A "0%" finding means the question was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

Click [show] to view polls conducted in 2017.

U.S. Senate general election in West Virginia, Mountain State Polls
Poll	Joe Manchin	Evan Jenkins	Alex Mooney	Patrick Morrisey	Undecided/Other	Margin of error	Sample size

The Zogby Poll, Joe Manchin vs. Evan Jenkins (September 27-30, 2017)	49%	36%	0%	0%	15%	+/-5.5	320
The Zogby Poll, Joe Manchin vs. Alex Mooney (September 27-30, 2017)	49%	0%	35%	0%	17%	+/-5.5	320
The Zogby Poll, Joe Manchin vs. Patrick Morrisey (September 27-30, 2017)	45%	0%	0%	38%	17%	+/-5.5	320
MetroNews West Virginia, Joe Manchin vs. Evan Jenkins (August 11-20, 2017)	50%	40%	0%	0%	11%	+/-4.9	400
MetroNews West Virginia, Joe Manchin vs. Patrick Morrisey (August 11-20, 2017)	51%	0%	0%	37%	11%	+/-4.9	400
The Mountain State Poll, Joe Manchin vs. Evan Jenkins (March 24-29, 2017)	52%	28%	0%	0%	20%	+/-4.89	402
The Mountain State Poll, Joe Manchin vs. Patrick Morrisey (March 24-29, 2017)	51%	0%	0%	29%	20%	+/-4.89	402
AVERAGES	49.57%	14.86%	5%	14.86%	15.86%	+/-5.15	366.29
Note: The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected].

Click [show] to view polling in the Republican primary.

U.S. Senate election in West Virginia, Republican primary
Poll	Patrick Morrisey (R)	Evan Jenkins (R)	Don Blankenship (R)	Undecided/Other	Margin of Error	Sample Size

Public Opinion Strategies (commissioned by Morrisey) April 22-23, 2018	28%	26%	15%	18%	+/-4.4	500
Fox News April 18-22, 2018	21%	25%	16%	39%	+/-3.0	985
GOPAC April 17-19, 2018	24%	20%	12%	44%	+/-4.9	411
Harper Polling March 2018	19%	29%	27%	23%	+/-4.4	500
Osage Research March 2018	24%	17%	22%	37%	+/-4.4	500
Harper Polling February 5-6, 2018	25%	33%	18%	24%	+/-4.4	500
Fabrizio, Lee and Associates October 19-22, 2017	40%	34%	0%	26%	+/-4.9	400
Note: A "0%" finding means the question was not a part of the poll. The polls above may not reflect all polls that have been conducted in this race. Those displayed are a random sampling chosen by Ballotpedia staff. If you would like to nominate another poll for inclusion in the table, send an email to [email protected]

Race ratings

The following table compares the race ratings from The Cook Political Report, Sabato's Crystal Ball, and Inside Elections. It was updated biweekly.

Special elections to the 115th U.S. Congress

See also: Special elections to the 115th United States Congress (2017-2018)

In the 17 special elections called to fill vacancies in the 115th Congress in 2017 and 2018, nine Republicans and eight Democrats won. Four elections resulted in a partisan flip:

Doug Jones (D), U.S. Senate in Alabama;
Conor Lamb (D), Pennsylvania's 18th Congressional District;
Mary Gay Scanlon (D), Pennsylvania's 7th Congressional District; and
Susan Wild (D), Pennsylvania's 15th Congressional District.

Results of special elections to the 115th Congress
Race	Election date	Incumbent	Winner	Election MOV	Previous election MOV	2016 Presidential election MOV^[3]
Kansas' 4th Congressional District	April 11, 2017	Mike Pompeo	Ron Estes	R+6	R+31	R+27
Montana's At-Large Congressional District	May 25, 2017	Ryan Zinke	Greg Gianforte	R+6	R+15	R+21
California's 34th Congressional District	June 6, 2017	Xavier Becerra	Jimmy Gomez	D+18^[4]	D+54^[4]	D+73
Georgia's 6th Congressional District	June 20, 2017	Tom Price	Karen Handel	R+4	R+24	R+1
South Carolina's 5th Congressional District	June 20, 2017	Mick Mulvaney	Ralph Norman	R+3	R+20	R+18
Utah's 3rd Congressional District	November 7, 2017	Jason Chaffetz	John Curtis	R+32	R+47	R+24
U.S. Senate in Alabama	December 12, 2017	Jeff Sessions	Doug Jones	D+2	R+28	R+28
Pennsylvania's 18th Congressional District	March 13, 2018	Tim Murphy	Conor Lamb	D+0^[5]	R+100	R+19
Arizona's 8th Congressional District	April 24, 2018	Trent Franks	Debbie Lesko	R+6	R+38	R+21
Texas' 27th Congressional District	June 30, 2018	Blake Farenthold	Michael Cloud	R+23	R+24	R+23
Ohio's 12th Congressional District	August 7, 2018	Patrick Tiberi	Troy Balderson	R+1	R+40	R+11
Michigan's 13th Congressional District	November 6, 2018	John Conyers Jr.	Brenda Jones	D+78	D+61	D+61
U.S. Senate in Minnesota	November 6, 2018	Al Franken	Tina Smith	D+11	D+10	D+2
U.S. Senate in Mississippi	November 6, 2018	Thad Cochran	Cindy Hyde-Smith	R+8	R+22	R+18
New York's 25th Congressional District	November 6, 2018	Louise Slaughter	Joseph Morelle	D+16	D+12	D+16
Pennsylvania's 7th Congressional District	November 6, 2018	Patrick Meehan	Mary Gay Scanlon	D+6	R+19	D+2
Pennsylvania's 15th Congressional District	November 6, 2018	Charlie Dent	Susan Wild	D+0	R+20	R+8

Incumbents not running for re-election

See also: List of U.S. Congress incumbents who did not run for re-election in 2018

U.S. senators not running for re-election, 2018

0 Democrats
3 Republicans

Name:	Party:	Current office:
Bob Corker	Republican	Tennessee
Jeff Flake	Republican	Arizona
Orrin Hatch	Republican	Utah

Historical comparison of incumbents not running for re-election

The following table includes figures on Democratic and Republican members of Congress who either left office during their term or announced that they would not seek re-election for each election year since 2012.

Outgoing members of Congress, 2012-2018
Year	Chamber	Democrats not seeking re-election	Republicans not seeking re-election	Total not seeking re-election	Democrats leaving office early	Republicans leaving office early	Total leaving office early
2018
	U.S. Senate	0	3	3	1	2	3
	U.S. House	18	34	52	3	14	17
	Total	18	37	55	4	16	20
2016
	U.S. Senate	3	2	5	0	0	0
	U.S. House	16	24	40	2	5	7
	Total	19	26	45	2	5	7
2014
	U.S. Senate	5	2	7	3	2	5
	U.S. House	16	25	41	3	6	9
	Total	21	27	48	6	8	14
2012
	U.S. Senate	6	3	10^[6]	0	0	0
	U.S. House	23	20	43	4	1	5
	Total	29	23	53	4	1	5

Ballotpedia's Annual Congressional Competitiveness Report

See also: Annual Congressional Competitiveness Report, 2018

Ballotpedia’s 2018 study of competitiveness in congressional elections found that nearly 13 percent of incumbent U.S. representatives and senators would not be on the 2018 general election ballot.

HIGHLIGHTS

Of the U.S. representatives and U.S. senators who could have been eligible to run for re-election in 2018, 58 of them (12.9 percent) either decided not to do so or were defeated in a partisan primary before reaching the general election.

In those 58 open seats where an incumbent either decided not to seek re-election or was defeated in a primary before the general election, there were 16 races where the incumbent's district overlapped at least one pivot county (a county that voted twice to elect President Obama in 2008 and 2012, but then switched to supporting President Trump for 2016).

In 22 races, the incumbent chose instead to run for a statewide office or (in one case) for U.S. president. One of every 10 U.S. House races nationwide in 2018 featured just one major party candidate participating in the general election.

Outcome of recent presidential and gubernatorial elections

The following section compares data from recent presidential and gubernatorial elections with the party of the incumbent in each 2018 Senate race. These trends were used as an early indicator of expected competitive Senate races in the 2018 elections. All of these statistics predicted that the Democratic Party would be more vulnerable than the Republican Party in the 2018 Senate elections.

There were 10 states with a Democratic incumbent that Donald Trump won in 2016—Montana, North Dakota, Missouri, Wisconsin, Florida, West Virginia, Ohio, Indiana, Michigan, and Pennsylvania—and only one state with a Republican incumbent that was won by Hillary Clinton in 2016: Nevada.

There were 13 states with a Democratic incumbent that have a Republican governor—New Mexico, North Dakota, Missouri, Wisconsin, Florida, Ohio, Indiana, Michigan, Maryland, West Virginia, Massachusetts, Vermont, and Maine—but no states with a Republican incumbent and a Democratic governor.

There were four states that Barack Obama won in 2008 and 2012 that were won by Donald Trump in 2016—Florida, Michigan, Pennsylvania, and Wisconsin—but no states that were won by the Republican nominee in 2008 and 2012 (McCain and Romney) that were won by Hillary Clinton in 2016.

Key endorsements

Barack Obama

See also: Endorsements by Barack Obama

Donald Trump

See also: Endorsements by Donald Trump

Wave election analysis

See also: Wave elections (1918-2016)

The term wave election is frequently used to describe an election cycle in which one party makes significant electoral gains. How many seats would Republicans have had to lose for the 2018 midterm election to be considered a wave election?

Ballotpedia examined the results of the 50 election cycles that occurred between 1918 and 2016—spanning from President Woodrow Wilson's (D) second midterm in 1918 to Donald Trump's (R) first presidential election in 2016. We define wave elections as the 20 percent of elections in that period resulting in the greatest seat swings against the president's party.

Applying this definition to U.S. Senate elections, we found that Republicans needed to lose seven seats for 2018 to qualify as a wave election.

The chart below shows the number of seats the president's party lost in the 10 U.S. Senate waves from 1918 to 2016. Click here to read the full report.

U.S. Senate wave elections
Year	President	Party	Election type	Senate seats change	Senate majority^[7]
1932	Hoover	R	Presidential	-13	D (flipped)
1958	Eisenhower	R	Second midterm	-12	D
1946	Truman	D	First midterm	-10	R (flipped)
1980	Carter	D	Presidential	-9	R (flipped)
2014	Obama	D	Second midterm	-9	R (flipped)
1942	Roosevelt	D	Third midterm	-8	D
2008	George W. Bush	D	Presidential	-8	D
1926	Coolidge	R	First midterm^[8]	-7	R
1930	Hoover	R	First midterm	-7	R
1986	Reagan	R	Second midterm	-7	D (flipped)

Analysis of federal elections, 2018

See also: Ballotpedia's Election Analysis Hub, 2018

All 435 U.S. House seats and 33 U.S. Senate seats were up for regular elections in the 2018 midterms. Heading into the election, the Republican Party held a majority in both chambers.

All federal elections:

Ballotpedia's 2018 Candidate Connection report

United States Congress elections, 2018

Ballotpedia's Top 15 elections to watch, 2018

Special elections to the 115th United States Congress (2017-2018)

List of candidates who ran in U.S. Congress elections, 2018

List of U.S. Congress incumbents who did not run for re-election in 2018

Annual Congressional Competitiveness Report, 2018

Margin of victory analysis for the 2018 congressional elections

Incumbents defeated in 2018 congressional elections

Incumbent win rates by state

New members elected in 2018 congressional elections

Comparison of state delegations to the 115th and 116th Congresses

Congressional elections decided by 10 percent or less, 2018

Results of federal elected officials seeking other offices, 2018

Noteworthy minor party candidates in the 2018 elections

PredictIt markets in the 2018 elections

Fundraising in Congressional elections, 2018

Battleground election polls, 2018

Timeline of events impacting 2018 congressional elections

Media coverage of United States Congress elections, 2018

U.S. Senate elections:

U.S. Senate battlegrounds, 2018

United States Senate elections, 2018

Control of the U.S. Senate

States with both gubernatorial and U.S. Senate elections in 2018

U.S. House elections:

U.S. House battlegrounds, 2018

United States House of Representatives elections, 2018

Control of the U.S. House

U.S. House districts represented by a Republican and won by Hillary Clinton in 2016

U.S. House districts represented by a Democrat and won by Donald Trump in 2016

U.S. House elections without a Democratic or Republican candidate, 2018

Election issues

Click below to read about what members of the 115th Congress said about the following issues.

Throughout the course of the 115th Congress, we curated statements and reactions by members of Congress on a variety of different policy areas and topics. Click on a tile below to read about what members of the 115th Congress said about the following issues.

The American Health Care Act of 2017 (AHCA)

Energy and the Environment

Financial Policy

Healthcare

Immigration

Taxes

Trade

Footnotes

↑ ^1.0 ^1.1 Politico, "Republican Control of the Senate Hangs by a Thread," December 21, 2017
↑ Slate, "Are You Dreaming of Democrats Taking the Senate in 2018? Time to Wake Up." November 14, 2016
↑ Daily Kos, "2008, 2012, & 2016 Presidential Election Results by District," accessed July 11, 2018
↑ ^4.0 ^4.1 Both general election candidates were Democrats.
↑ Lamb won by a margin of 0.4 percentage points.
↑ Figure includes Sen. Joe Lieberman (I-Conn.).
↑ Denotes the party that had more seats in the U.S. House following the election.
↑ Calvin Coolidge's (R) first term began in August 1923 after the death of President Warren Harding (R), who was first elected in 1920. Before he had his first midterm in 1926, Coolidge was re-elected as president in 1924.

[politicopartisan-1] 1.0 ^1.1 Politico, "Republican Control of the Senate Hangs by a Thread," December 21, 2017

[2] Slate, "Are You Dreaming of Democrats Taking the Senate in 2018? Time to Wake Up." November 14, 2016

[3] Daily Kos, "2008, 2012, & 2016 Presidential Election Results by District," accessed July 11, 2018

[Dems-4] 4.0 ^4.1 Both general election candidates were Democrats.

[5] Lamb won by a margin of 0.4 percentage points.

[6] Figure includes Sen. Joe Lieberman (I-Conn.).

[7] Denotes the party that had more seats in the U.S. House following the election.

[CC-8] Calvin Coolidge's (R) first term began in August 1923 after the death of President Warren Harding (R), who was first elected in 1920. Before he had his first midterm in 1926, Coolidge was re-elected as president in 1924.

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United States Senate elections, 2018

2018 election analysis and context

Election results

Margin of victory

Pre-election analysis

Partisan breakdown

Battlegrounds

List of all U.S. Senate elections in 2018

Polls

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U.S. senators not running for re-election, 2018

Historical comparison of incumbents not running for re-election

Ballotpedia's Annual Congressional Competitiveness Report

Outcome of recent presidential and gubernatorial elections

Key endorsements

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Donald Trump

Wave election analysis

Analysis of federal elections, 2018

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