# 2014 United States Senate elections

The 2014 United States Senate elections were held on November 4, 2014. A total of 36 seats in the 100-member U.S. Senate were contested. 33 Class 2 seats were contested for regular 6-year terms to be served from January 3, 2015, to January 3, 2021, and 3 Class 3 seats were contested in special elections due to Senate vacancies. The elections marked 100 years of direct elections of U.S. senators. Going into the elections, 21 of the contested seats were held by the Democratic Party, while 15 were held by the Republican Party.
The Republicans regained the majority of the Senate in the 114th Congress, which started in January 2015; the Republicans had not controlled the Senate since January 2007. They needed a net gain of at least 6 seats to obtain a majority and were projected by polls to do so. On election night, they held all of their seats and gained 9 Democratic-held seats. Republicans defeated 5 Democratic incumbents: Mark Begich of Alaska lost to Dan Sullivan, Mark Pryor of Arkansas lost to Tom Cotton, Mark Udall of Colorado lost to Cory Gardner, Mary Landrieu of Louisiana lost to Bill Cassidy, and Kay Hagan of North Carolina lost to Thom Tillis. Republicans also picked up another 4 open seats in Iowa, Montana, South Dakota, and West Virginia that were previously held by Democrats. Democrats did not pick up any Republican-held seats, but they did hold an open seat in Michigan.
This was the most recent time that any party lost control of the Senate in a midterm election cycle. With a total net gain of 9 seats, the Republicans made the largest Senate gain by any party since 1980. This is also the first election cycle since 1980 in which more than 2 incumbent Democratic senators were defeated by their Republican challengers. Days after the election cycle, the United States Election Project estimated that 36.4% of eligible voters voted, 4% lower than the 2010 elections, and possibly the lowest turnout rate since the 1942 election cycle.
As of 2024, this remains the last time that a Republican has won a U.S. Senate election in Colorado and the last time that the president's party has suffered a net loss of Senate seats in a midterm election cycle.

## Partisan composition

For a majority, Republicans needed at least 51 seats. Democrats could have retained a majority with 48 seats (assuming the two Independents continued to caucus with them) because the Democratic Vice President Joe Biden would become the tie-breaker. From 1915 to 2013, control of the U.S. Senate flipped in 10 of 50 cycles, or 20% of the time. Republicans had lost ground in the 2012 elections, leading to an internal fight among the Republican leadership over the best strategies and tactics for the 2014 Senate races. By December 2013, eight of the twelve incumbent Republicans running for re-election saw Tea Party challenges. However, Republican incumbents won every primary challenge. Although Democrats saw some opportunities for pickups, the combination of Democratic retirements and numerous Democratic seats up for election in swing states and red states gave Republicans hopes of taking control of the Senate. 7 of the 21 states with Democratic seats up for election in 2014 had voted for Republican Mitt Romney in the 2012 presidential election compared to just 1 state with a Republican senator that voted for Barack Obama. Democrats also faced the lower voter turnout that accompanies mid-term elections.
Poll aggregation website FiveThirtyEight gave the Republican Party a 60% chance of taking control of the Senate as of September 28. Another poll aggregation website, RealClearPolitics, gave the Republican Party a net gain of 7 seats. Due to the closeness of several races, it was initially believed that Senate control might not be decided on election night. Both Louisiana and Georgia were seen as competitive, and both states require a run-off election if no candidate takes a majority of the vote.
Two independent candidates (in Kansas and South Dakota) refused to commit to caucusing with either party. In the final months of the race, polls showed them with viable chances of winning, leading some analysts to speculate on the possibility of an "Independent caucus" that could also include Maine Senator Angus King and possibly Vermont Senator Bernie Sanders. However, no Independent won a Senate race in 2014, and King and Sanders continue to caucus with the Democratic Party following the 2014 election cycle.
By midnight ET, most major networks projected that the Republicans would take control of the Senate. The party held all three competitive Republican-held seats (Kentucky, Kansas, and Georgia), and defeated incumbent Democrats in North Carolina, Colorado, and Arkansas. Combined with the pick-ups of open seats in Iowa, Montana, South Dakota, and West Virginia, the Republicans made a net gain of 7 seats before the end of the night. Republicans defeated three incumbent Democrats, a task the party had not accomplished since the 1980 election cycle. Five of the seven confirmed pickups were in states that voted for Mitt Romney in 2012, but two of the seats that Republicans won represent states that voted for Barack Obama in 2012 (Colorado and Iowa). Of the three races that were not called by the end of election night, Alaska and Virginia were still too close to call, while Louisiana held a December 6 run-off election. Virginia declared Democrat Mark Warner the winner of his race by a narrow margin over Republican Ed Gillespie on November 7, and Alaska declared Dan Sullivan the winner against Democratic incumbent Mark Begich a week later, on November 12. Republican Bill Cassidy defeated Democratic incumbent Mary Landrieu in the Louisiana runoff on December 6.

### Election spending

Altogether, at least $3.67 billion was spent by candidates, parties, committees and outside groups in the 2014 election cycle. Spending on the 2014 Senate elections by outside groups (i.e., organizations other than a candidate's campaign, such as super PACs and "dark money" nonprofit groups) more than doubled from 2010. In the 10 competitive races for which data was available, outside groups accounted for 47% of spending, candidates accounted for 41% of spending, and parties accounted for 12% of spending. The Senate race with the most outside spending was in North Carolina, at $80 million, a new record.
The top outside spenders in the 11 most competitive Senate races were the following:
* On the Republican side, the National Republican Senatorial Committee, Crossroads GPS, U.S. Chamber of Commerce, Ending Spending Action Fund, Freedom Partners Action Fund, American Crossroads, and the NRA Political Victory Fund.
* On the Democratic side, the Democratic Senatorial Campaign Committee, Senate Majority PAC, and NextGen Climate Action Committee.

## Results summary

The Republican Party made a net gain of nine U.S. Senate seats in the 2014 elections.
Going into the elections, there were 53 Democratic, 45 Republican and 2 independent senators (both of whom caucus with the Democrats). In all, there were 36 elections: 33 senators were up for election this year as class 2 senators, and 3 faced special elections (all from Class 3). Of all these seats, 21 were held by Democrats and 15 were held by Republicans.
| 44 | 2 | 54 |
| Democratic | Independent | Republican |
Colored shading indicates party with largest share of that row.
| Parties | Parties | | | | | | | Total |
| Parties | Parties | Democratic | Republican | Independent | Libertarian | Green | Other | Total |
| Before these elections | Before these elections | 53 | 45 | 2 | — | — | — | 100 |
| Not up | Not up | 32 | 30 | 2 | — | — | — | 64 |
| | Class 1 (2012→2018) | 23 | 8 | 2 | — | — | — | 33 |
| | Class 3 (2010→2016) | 9 | 22 | — | — | — | — | 31 |
| Up | Up | 21 | 15 | — | — | — | — | 36 |
| | General: Class 2 | 20 | 13 | — | — | — | — | 33 |
| | Special: Class 3 | 1 | 2 | — | — | — | — | 3 |
| Incumbent retired | Incumbent retired | 4 | 3 | — | — | — | — | 7 |
| | Held by same party | 1 | 3 | — | — | — | — | 4 |
| | Replaced by other party | 3 Democrats replaced by 3 Republicans | 3 Democrats replaced by 3 Republicans | — | — | — | — | 3 |
| | Result | 1 | 6 | — | — | — | — | 7 |
| Incumbent ran | Incumbent ran | 17 | 12 | — | — | — | — | 29 |
| | Won election | 11 | 12 | — | — | — | — | 23 |
| | Lost re-election | 5 Democrats replaced by 5 Republicans | 5 Democrats replaced by 5 Republicans | — | — | — | — | 5 |
| | Lost renomination but held by same party | — | — | — | — | — | — | 0 |
| | Withdrew from nomination and party lost | 1 Democrat replaced by 1 Republican | 1 Democrat replaced by 1 Republican | — | — | — | — | 1 |
| | Result | 11 | 18 | — | — | — | — | 29 |
| Total elected | Total elected | 12 | 24 | 0 | — | — | — | 36 |
| Net gain/loss | Net gain/loss | 9 | 9 | — | — | — | — | 9 |
| Nationwide vote | Nationwide vote | 19,786,883 | 23,253,636 | 698,161 | 879,722 | 152,703 | 394,075 | 45,165,180 |
| | Share | 43.81% | 51.49% | 1.55% | 1.95% | 0.34% | 0.87% | 100% |
| Result | Result | 44 | 54 | 2 | — | — | — | 100 |
Source: Clerk of the U.S. House of Representatives

## Change in composition
### Before the elections

| D$_1$ | D$_2$ | D$_3$ | D$_4$ | D$_5$ | D$_6$ | D$_7$ | D$_8$ | D$_9$ | D$_{10}$ |
| D$_{20}$ | D$_{19}$ | D$_{18}$ | D$_{17}$ | D$_{16}$ | D$_{15}$ | D$_{14}$ | D$_{13}$ | D$_{12}$ | D$_{11}$ |
| D$_{21}$ | D$_{22}$ | D$_{23}$ | D$_{24}$ | D$_{25}$ | D$_{26}$ | D$_{27}$ | D$_{28}$ | D$_{29}$ | D$_{30}$ |
| D$_{40}$ Mass. Ran | D$_{39}$ La. Ran | D$_{38}$ Ill. Ran | D$_{37}$ Hawaii (sp) Ran | D$_{36}$ Del. Ran | D$_{35}$ Colo. Ran | D$_{34}$ Ark. Ran | D$_{33}$ Alaska Ran | D$_{32}$ | D$_{31}$ |
| D$_{41}$ Minn. Ran | D$_{42}$ N.H. Ran | D$_{43}$ N.J. Ran | D$_{44}$ N.M. Ran | D$_{45}$ N.C. Ran | D$_{46}$ Ore. Ran | D$_{47}$ R.I. Ran | D$_{48}$ Va. Ran | D$_{49}$ Iowa Retired | D$_{50}$ Mich. Retired |
| Majority→ | Majority→ | Majority→ | Majority→ | Majority→ | Majority→ | Majority→ | Majority→ | Majority→ | D$_{51}$ S.D. Retired |
| R$_{41}$ Texas Ran | R$_{42}$ Wyo. Ran | R$_{43}$ Okla. (sp) Resigned | R$_{44}$ Ga. Retired | R$_{45}$ Neb. Retired | I$_1$ | I$_2$ | D$_{53}$ Mont. Withdrew | D$_{52}$ W.Va. Retired | D$_{51}$ S.D. Retired |
| R$_{40}$ Tenn. Ran | R$_{39}$ S.C. (sp) Ran | R$_{38}$ S.C. (reg) Ran | R$_{37}$ Okla. (reg) Ran | R$_{36}$ Miss. Ran | R$_{35}$ Me. Ran | R$_{34}$ Ky. Ran | R$_{33}$ Kan. Ran | R$_{32}$ Idaho Ran | R$_{31}$ Ala. Ran |
| R$_{21}$ | R$_{22}$ | R$_{23}$ | R$_{24}$ | R$_{25}$ | R$_{26}$ | R$_{27}$ | R$_{28}$ | R$_{29}$ | R$_{30}$ |
| R$_{20}$ | R$_{19}$ | R$_{18}$ | R$_{17}$ | R$_{16}$ | R$_{15}$ | R$_{14}$ | R$_{13}$ | R$_{12}$ | R$_{11}$ |
| R$_1$ | R$_2$ | R$_3$ | R$_4$ | R$_5$ | R$_6$ | R$_7$ | R$_8$ | R$_9$ | R$_{10}$ |

### After the elections

| D$_1$ | D$_2$ | D$_3$ | D$_4$ | D$_5$ | D$_6$ | D$_7$ | D$_8$ | D$_9$ | D$_{10}$ |
| D$_{20}$ | D$_{19}$ | D$_{18}$ | D$_{17}$ | D$_{16}$ | D$_{15}$ | D$_{14}$ | D$_{13}$ | D$_{12}$ | D$_{11}$ |
| D$_{21}$ | D$_{22}$ | D$_{23}$ | D$_{24}$ | D$_{25}$ | D$_{26}$ | D$_{27}$ | D$_{28}$ | D$_{29}$ | D$_{30}$ |
| D$_{40}$ N.J. Re-elected | D$_{39}$ N.H. Re-elected | D$_{38}$ Minn. Re-elected | D$_{37}$ Mich. Hold | D$_{36}$ Mass. Re-elected | D$_{35}$ Ill. Re-elected | D$_{34}$ Hawaii (sp) Elected | D$_{33}$ Del. Re-elected | D$_{32}$ | D$_{31}$ |
| D$_{41}$ N.M. Re-elected | D$_{42}$ Ore. Re-elected | D$_{43}$ R.I. Re-elected | D$_{44}$ Va. Re-elected | I$_1$ | I$_2$ | R$_{54}$ W.Va. Gain | R$_{53}$ S.D. Gain | R$_{52}$ N.C. Gain | R$_{51}$ Mont. Gain |
| R$_{51}$ Mont. Gain |||||||||
| R$_{41}$ S.C. (reg) Re-elected | R$_{42}$ S.C. (sp) Elected | R$_{43}$ Tenn. Re-elected | R$_{44}$ Texas Re-elected | R$_{45}$ Wyo. Re-elected | R$_{46}$ Alaska Gain | R$_{47}$ Ark. Gain | R$_{48}$ Colo. Gain | R$_{49}$ Iowa Gain | R$_{50}$ La. Gain |
| R$_{40}$ Okla. (sp) Hold | R$_{39}$ Okla. (reg) Re-elected | R$_{38}$ Neb. Hold | R$_{37}$ Miss. Re-elected | R$_{36}$ Me. Re-elected | R$_{35}$ Ky. Re-elected | R$_{34}$ Kan. Re-elected | R$_{33}$ Idaho Re-elected | R$_{32}$ Ga. Hold | R$_{31}$ Ala. Re-elected |
| R$_{21}$ | R$_{22}$ | R$_{23}$ | R$_{24}$ | R$_{25}$ | R$_{26}$ | R$_{27}$ | R$_{28}$ | R$_{29}$ | R$_{30}$ |
| R$_{20}$ | R$_{19}$ | R$_{18}$ | R$_{17}$ | R$_{16}$ | R$_{15}$ | R$_{14}$ | R$_{13}$ | R$_{12}$ | R$_{11}$ |
| R$_1$ | R$_2$ | R$_3$ | R$_4$ | R$_5$ | R$_6$ | R$_7$ | R$_8$ | R$_9$ | R$_{10}$ |
| Key: | D$_#$ Democratic R$_#$ Republican I$_#$ Independent, caucusing with the Democrats |

## Gains and losses
### Retirements

Four Democrats and two Republicans retired instead of seeking re-election. Max Baucus of Montana announced his intent to retire at the end of his term, but he resigned on February 6, 2014, after being appointed as the United States Ambassador to China. John Walsh, who was appointed by Montana governor Steve Bullock to finish Baucus's term, later withdrew to run for a full term (see Nomination withdrawn section below).
| State | Senator | Replaced by |
| Georgia | Saxby Chambliss | David Perdue |
| Iowa | Tom Harkin | Joni Ernst |
| Michigan | Carl Levin | Gary Peters |
| Nebraska | Mike Johanns | Ben Sasse |
| South Dakota | Tim Johnson | Mike Rounds |
| West Virginia | Jay Rockefeller | Shelley Moore Capito |

### Resignations

One Republican resigned four years into his six-year term.
| State | Senator | Replaced by |
| Oklahoma (special) | Tom Coburn | James Lankford |

### Nomination withdrawn

One Democrat was originally to seek election for a full 6-year term in office but withdrew.
| State | Senator | Replaced by |
| Montana | John Walsh | Steve Daines |

### Defeats

Five Democrats sought re-election but lost in the general election.
| State | Senator | Replaced by |
| Alaska | Mark Begich | Dan Sullivan |
| Arkansas | Mark Pryor | Tom Cotton |
| Colorado | Mark Udall | Cory Gardner |
| Louisiana | Mary Landrieu | Bill Cassidy |
| North Carolina | Kay Hagan | Thom Tillis |

## Race summaries
### Special elections during the preceding Congress

In these special elections, the winners were elected during 2014 and seated before January 3, 2015 — except that one was seated on January 3, 2015, the effective date of the predecessor's resignation.
| State | Incumbent | Incumbent | Incumbent | Results | Candidates |
| State | Senator | Party | Electoral history | Results | Candidates |
| Hawaii (Class 3) | Brian Schatz | Democratic | 2012 (appointed) | Interim appointee elected. | ▌Y Brian Schatz (Democratic) 69.8% ▌Campbell Cavasso (Republican) 27.7% ▌Michael A. Kokoski (Libertarian) 2.5% |
| Oklahoma (Class 3) | Tom Coburn | Republican | 2004 2010 | Incumbent resigned, effective January 3, 2015. Republican hold. | ▌Y James Lankford (Republican) 67.9% ▌Connie Johnson (Democratic) 29.0% ▌Mark T. Beard (Independent) 3.2% |
| South Carolina (Class 3) | Tim Scott | Republican | 2013 (appointed) | Interim appointee elected. | ▌Y Tim Scott (Republican) 61.1% ▌Joyce Dickerson (Democratic) 37.1% ▌Jill Bossi (American) 1.8% |

### Elections leading to the next Congress

In these general elections, the winners were elected for the term beginning January 3, 2015; ordered by state.
All of the elections involved the Class 2 seats.
| State | Incumbent | Incumbent | Incumbent | Results | Candidates |
| State | Senator | Party | Electoral history | Results | Candidates |
| Alabama | Jeff Sessions | Republican | 1996 2002 2008 | Incumbent re-elected. | ▌Y Jeff Sessions (Republican) 97.25% Write-ins 2.75% |
| Alaska | Mark Begich | Democratic | 2008 | Incumbent lost re-election. Republican gain. | ▌Y Dan Sullivan (Republican) 48.0% ▌Mark Begich (Democratic) 45.8% ▌Mark Fish (Libertarian) 3.7% ▌Ted Gianoutsos (Independent) 2.0% |
| Arkansas | Mark Pryor | Democratic | 2002 2008 | Incumbent lost re-election. Republican gain. | ▌Y Tom Cotton (Republican) 56.5% ▌Mark Pryor (Democratic) 39.4% Others ▌Nathan LaFrance (Libertarian) 2.0% ▌Mark Swaney (Green) 2.0% |
| Colorado | Mark Udall | Democratic | 2008 | Incumbent lost re-election. Republican gain. | ▌Y Cory Gardner (Republican) 48.2% ▌Mark Udall (Democratic) 46.3% ▌Gaylon Kent (Libertarian) 2.6% Others ▌Stephen H. Shogan (Independent) 1.4% ▌Raúl Acosta (Independent) 1.2% ▌Bill Hammons (Unity) 0.3% |
| Delaware | Chris Coons | Democratic | 2010 (special) | Incumbent re-elected. | ▌Y Chris Coons (Democratic) 55.8% ▌Kevin L. Wade (Republican) 42.2% ▌Andrew Groff (Green) 1.9% |
| Georgia | Saxby Chambliss | Republican | 2002 2008 | Incumbent retired. Republican hold. | ▌Y David Perdue (Republican) 52.9% ▌Michelle Nunn (Democratic) 45.2% ▌Amanda Swafford (Libertarian) 1.9% |
| Idaho | Jim Risch | Republican | 2008 | Incumbent re-elected. | ▌Y Jim Risch (Republican) 65.3% ▌Nels Mitchell (Democratic) 34.7% |
| Illinois | Dick Durbin | Democratic | 1996 2002 2008 | Incumbent re-elected. | ▌Y Dick Durbin (Democratic) 53.5% ▌Jim Oberweis (Republican) 42.7% ▌Sharon Hansen (Libertarian) 3.8% |
| Iowa | Tom Harkin | Democratic | 1984 1990 1996 2002 2008 | Incumbent retired. New senator elected. Republican gain. | ▌Y Joni Ernst (Republican) 52.1% ▌Bruce Braley (Democratic) 43.8% Others ▌Rick Stewart (Independent) 2.4% ▌Doug Butzier (Libertarian) 0.7% ▌Bob Quast (Independent) 0.5% ▌Ruth Smith (Independent) 0.4% |
| Kansas | Pat Roberts | Republican | 1996 2002 2008 | Incumbent re-elected. | ▌Y Pat Roberts (Republican) 53.1% ▌Greg Orman (Independent) 42.5% ▌Randall Batson (Libertarian) 4.3% |
| Kentucky | Mitch McConnell | Republican | 1984 1990 1996 2002 2008 | Incumbent re-elected. | ▌Y Mitch McConnell (Republican) 56.1% ▌Alison Lundergan Grimes (Democratic) 40.7% ▌David Patterson (Libertarian) 3.1% |
| Louisiana | Mary Landrieu | Democratic | 1996 2002 2008 | Incumbent lost re-election in runoff. Republican gain. | ▌Y Bill Cassidy (Republican) 55.9% ▌Mary Landrieu (Democratic) 44.1% |
| Maine | Susan Collins | Republican | 1996 2002 2008 | Incumbent re-elected. | ▌Y Susan Collins (Republican) 68.5% ▌Shenna Bellows (Democratic) 31.5% |
| Massachusetts | Ed Markey | Democratic | 2013 (special) | Incumbent re-elected. | ▌Y Ed Markey (Democratic) 62.0% ▌Brian Herr (Republican) 38.0% |
| Michigan | Carl Levin | Democratic | 1978 1984 1990 1996 2002 2008 | Incumbent retired. Democratic hold. | ▌Y Gary Peters (Democratic) 54.6% ▌Terri Lynn Land (Republican) 41.3% Others ▌Jim Fulner (Libertarian) 2.0% ▌Richard Matkin (U.S. Taxpayers) 1.2% ▌Chris Wahmhoff (Green) 0.9% |
| Minnesota | Al Franken | DFL | 2008 | Incumbent re-elected. | ▌Y Al Franken (DFL) 53.2% ▌Mike McFadden (Republican) 42.9% Others ▌Steve Carlson (Independence) 2.4% ▌Heather Johnson (Libertarian) 1.5% |
| Mississippi | Thad Cochran | Republican | 1978 1984 1990 1996 2002 2008 | Incumbent re-elected. | ▌Y Thad Cochran (Republican) 59.9% ▌Travis Childers (Democratic) 37.9% ▌Shawn O'Hara (Reform) 2.2% |
| Montana | John Walsh | Democratic | 2014 (appointed) | Interim appointee nominated but withdrew. Republican gain. | ▌Y Steve Daines (Republican) 57.8% ▌Amanda Curtis (Democratic) 40.1% ▌Roger Roots (Libertarian) 2.1 |
| Nebraska | Mike Johanns | Republican | 2008 | Incumbent retired. Republican hold. | ▌Y Ben Sasse (Republican) 64.4% ▌David Domina (Democratic) 31.5% ▌Jim Jenkins (Independent) 2.9% ▌Todd Watson (Independent) 1.2% |
| New Hampshire | Jeanne Shaheen | Democratic | 2008 | Incumbent re-elected. | ▌Y Jeanne Shaheen (Democratic) 51.5% ▌Scott Brown (Republican) 48.2% |
| New Jersey | Cory Booker | Democratic | 2013 (special) | Incumbent re-elected. | ▌Y Cory Booker (Democratic) 55.8% ▌Jeff Bell (Republican) 42.3% Others ▌Joe Baratelli (Libertarian) 0.9% ▌Hank Schroeder (Economic Growth) 0.3% ▌Jeff Boss (Independent) 0.2% ▌Eugene M. LaVergne (Independent) 0.2% ▌Antonio Sabas (Independent) 0.2% |
| New Mexico | Tom Udall | Democratic | 2008 | Incumbent re-elected. | ▌Y Tom Udall (Democratic) 55.6% ▌Allen Weh (Republican) 44.4% |
| North Carolina | Kay Hagan | Democratic | 2008 | Incumbent lost re-election. Republican gain. | ▌Y Thom Tillis (Republican) 48.8% ▌Kay Hagan (Democratic) 47.3% ▌Sean Haugh (Libertarian) 3.7% |
| Oklahoma | Jim Inhofe | Republican | 1994 1996 2002 2008 | Incumbent re-elected. | ▌Y Jim Inhofe (Republican) 68.0% ▌Matt Silverstein (Democratic) 28.6% Others ▌Joan Farr (Independent) 1.3% ▌Ray Woods (Independent) 1.2% ▌Aaron DeLozier (Independent) 0.9% |
| Oregon | Jeff Merkley | Democratic | 2008 | Incumbent re-elected. | ▌Y Jeff Merkley (Democratic) 55.7% ▌Monica Wehby (Republican) 36.9% ▌Mike Montchalin (Libertarian) 3.1% Others ▌Christina Jean Lugo (Pacific Green) 2.2% ▌James E. Leuenberger (Constitution) 1.7% |
| Rhode Island | Jack Reed | Democratic | 1996 2002 2008 | Incumbent re-elected. | ▌Y Jack Reed (Democratic) 70.6% ▌Mark Zaccaria (Republican) 29.2% |
| South Carolina | Lindsey Graham | Republican | 2002 2008 | Incumbent re-elected. | ▌Y Lindsey Graham (Republican) 54.3% ▌Brad Hutto (Democratic) 38.8% ▌Thomas Ravenel (Independent) 3.8% ▌Victor Kocher (Libertarian) 2.7% |
| South Dakota | Tim Johnson | Democratic | 1996 2002 2008 | Incumbent retired. Republican gain. | ▌Y Mike Rounds (Republican) 50.4% ▌Rick Weiland (Democratic) 29.5% ▌Larry Pressler (Independent) 17.1% ▌Gordon Howie (Independent) 3.0% |
| Tennessee | Lamar Alexander | Republican | 2002 2008 | Incumbent re-elected. | ▌Y Lamar Alexander (Republican) 61.9% ▌Gordon Ball (Democratic) 31.9% ▌Joe B. Wilmoth (Constitution) 2.6% Others ▌Martin Pleasant (Green) 0.9% ▌Tom Emerson Jr. (Independent) 0.8% ▌Danny Page (Independent) 0.6% ▌Rick Tyler (Independent) 0.4% ▌Joshua James (Independent) 0.4% ▌Bartholomew J. Phillips (Independent) 0.2% ▌Edmund L. Gauthier (Independent) 0.2% ▌Eric Schechter (Independent) 0.1% ▌Choudhury Salekin (Independent) 0.1% |
| Texas | John Cornyn | Republican | 2002 2002 (appointed) 2008 | Incumbent re-elected. | ▌Y John Cornyn (Republican) 61.6% ▌David Alameel (Democratic) 34.4% ▌Rebecca Paddock (Libertarian) 2.9% ▌Emily Marie Sanchez (Green) 1.2% |
| Virginia | Mark Warner | Democratic | 2008 | Incumbent re-elected. | ▌Y Mark Warner (Democratic) 49.1% ▌Ed Gillespie (Republican) 48.3% ▌Robert Sarvis (Libertarian) 2.4% |
| West Virginia | Jay Rockefeller | Democratic | 1984 1990 1996 2002 2008 | Incumbent retired. Republican gain. | ▌Y Shelley Moore Capito (Republican) 62.1% ▌Natalie Tennant (Democratic) 34.5% Others ▌John S. Buckley (Libertarian) 1.6% ▌Bob Henry Baber (Mountain) 1.2% ▌Phil Hudok (Constitution) 0.6% |
| Wyoming | Mike Enzi | Republican | 1996 2002 2008 | Incumbent re-elected. | ▌Y Mike Enzi (Republican) 71.2% ▌Charlie Hardy (Democratic) 17.4% ▌Curt Gottshall (Independent) 7.9% ▌Joe Porambo (Libertarian) 2.2% |

## Closest races

In seven races the margin of victory was under 10%.
| District | Winner | Margin |
| Virginia | Democratic | 0.8% |
| North Carolina | Republican (flip) | 1.5% |
| Colorado | Republican (flip) | 1.9% |
| Alaska | Republican (flip) | 2.2% |
| New Hampshire | Democratic | 3.3% |
| Georgia | Republican | 7.7% |
| Iowa | Republican (flip) | 8.3% |

## Final pre-election predictions
### Predicted probability of Republican takeover

Several websites used poll aggregation and psephology to estimate the probability that the Republican Party would gain enough seats to take control of the Senate.
| Source | Probability of Republican control | Updated |
| FiveThirtyEight | 76.2% | Nov 4 |
| Princeton Election Consortium (Sam Wang) | 65% | Nov 3 |
| Huffington Post | 79% | Nov 3 |
| The Upshot (The New York Times) | 70% | Nov 3 |
| The Washington Post | 97% | Nov 3 |
| Daily Kos | 90% | Nov 4 |

### Predictions

Republicans needed to win at least six in order to gain a majority of 51 seats and Democrats needed to win at least seven in order to hold a majority of 50 seats (including the two independents who currently caucus with the Democrats) and the tie-breaking vote of Vice President Joe Biden.
| State | PVI | Incumbent | Last election | Cook Oct. 29, 2014 | Daily Kos Nov. 3, 2014 | 538 Oct. 29, 2014 | NYT Oct. 29, 2014 | RCP Oct. 29, 2014 | Rothenberg Oct. 29, 2014 | Sabato Oct. 29, 2014 | Jay DeSart Oct. 28, 2014 | Winner |
| Alabama | R+14 | Jeff Sessions | 63.4% | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Sessions (97.3%) |
| Alaska | R+12 | Mark Begich | 47.8% | Tossup | Likely R (flip) | Lean R (flip) | Lean R (flip) | Tossup | Tilt R (flip) | Lean R (flip) | Lean R (flip) | Sullivan (48.0%) (flip) |
| Arkansas | R+14 | Mark Pryor | 79.5% | Tossup | Safe R (flip) | Safe R (flip) | Likely R (flip) | Lean R (flip) | Lean R (flip) | Likely R (flip) | Lean R (flip) | Cotton (56.5%) (flip) |
| Colorado | D+1 | Mark Udall | 52.8% | Tossup | Likely R (flip) | Likely R (flip) | Likely R (flip) | Tossup | Tilt R (flip) | Lean R (flip) | Lean R (flip) | Gardner (48.2%) (flip) |
| Delaware | D+8 | Chris Coons | 56.6% (2010 sp.) | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Coons (55.8%) |
| Georgia | R+6 | Saxby Chambliss (retiring) | 57.4% | Tossup | Safe R | Likely R | Lean R | Tossup | Tossup | Lean R | Lean R | Perdue (52.9%) |
| Hawaii (special) | D+20 | Brian Schatz | Appointed (2012) | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Schatz (69.8%) |
| Idaho | R+18 | Jim Risch | 57.7% | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Risch (65.3%) |
| Illinois | D+8 | Dick Durbin | 67.8% | Safe D | Safe D | Safe D | Safe D | Likely D | Safe D | Safe D | Safe D | Durbin (53.5%) |
| Iowa | D+1 | Tom Harkin (retiring) | 62.7% | Tossup | Likely R (flip) | Likely R (flip) | Lean R (flip) | Tossup | Tossup | Lean R (flip) | Lean R (flip) | Ernst (52.1%) (flip) |
| Kansas | R+12 | Pat Roberts | 60.1% | Tossup | Safe R | Lean I (flip) | Tossup | Tossup | Tossup | Lean R | Tossup | Roberts (53.1%) |
| Kentucky | R+13 | Mitch McConnell | 53.0% | Lean R | Safe R | Safe R | Safe R | Lean R | Likely R | Likely R | Likely R | McConnell (56.2%) |
| Louisiana | R+12 | Mary Landrieu | 52.1% | Lean R (flip) | Likely R (flip) | Likely R (flip) | Likely R (flip) | Likely R (flip) | Lean R (flip) | Safe R (flip) | Likely R (flip) | Cassidy (55.9%) (flip) |
| Maine | D+6 | Susan Collins | 61.3% | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Collins (68.5%) |
| Massachusetts | D+10 | Ed Markey | 54.8% (2013 sp.) | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Markey (61.9%) |
| Michigan | D+4 | Carl Levin (retiring) | 62.7% | Lean D | Safe D | Safe D | Safe D | Safe D | Likely D | Likely D | Safe D | Peters (54.6%) |
| Minnesota | D+2 | Al Franken | 41.99% | Likely D | Safe D | Safe D | Safe D | Likely D | Likely D | Likely D | Safe D | Franken (53.2%) |
| Mississippi | R+9 | Thad Cochran | 61.4% | Likely R | Safe R | Safe R | Safe R | Likely R | Safe R | Safe R | Safe R | Cochran (59.9%) |
| Montana | R+7 | John Walsh (withdrew) | Appointed (2014) | Safe R (flip) | Safe R (flip) | Safe R (flip) | Safe R (flip) | Safe R (flip) | Safe R (flip) | Safe R (flip) | Safe R (flip) | Daines (57.8%) (flip) |
| Nebraska | R+12 | Mike Johanns (retiring) | 57.5% | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Sasse (64.5%) |
| New Hampshire | D+1 | Jeanne Shaheen | 51.6% | Tossup | Tilt D | Likely D | Lean D | Tossup | Tilt D | Lean D | Tilt D | Shaheen (51.6%) |
| New Jersey | D+6 | Cory Booker | 54.9% (2013 sp.) | Safe D | Safe D | Safe D | Safe D | Likely D | Safe D | Safe D | Safe D | Booker (55.8%) |
| New Mexico | D+4 | Tom Udall | 61.3% | Safe D | Safe D | Safe D | Safe D | Likely D | Safe D | Safe D | Safe D | T. Udall (55.6%) |
| North Carolina | R+3 | Kay Hagan | 52.7% | Tossup | Tossup | Lean D | Lean D | Tossup | Tossup | Lean D | Tossup | Tillis (48.8%) (flip) |
| Oklahoma (regular) | R+19 | Jim Inhofe | 56.7% | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Inhofe (68.0%) |
| Oklahoma (special) | R+19 | Tom Coburn (retiring) | 70.6% (2010) | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Lankford (67.9%) |
| Oregon | D+5 | Jeff Merkley | 48.9% | Likely D | Safe D | Safe D | Safe D | Likely D | Likely D | Likely D | Safe D | Merkley (55.7%) |
| Rhode Island | D+11 | Jack Reed | 73.4% | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Safe D | Reed (70.6%) |
| South Carolina (regular) | R+8 | Lindsey Graham | 57.5% | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Graham (55.3%) |
| South Carolina special) | R+8 | Tim Scott | Appointed (2013) | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Scott (61.1%) |
| South Dakota | R+10 | Tim Johnson (retiring) | 62.5% | Lean R (flip) | Likely R (flip) | Safe R (flip) | Safe R (flip) | Likely R (flip) | Likely R (flip) | Likely R (flip) | Safe R (flip) | Rounds (50.4%) (flip) |
| Tennessee | R+12 | Lamar Alexander | 65.14% | Safe R | Safe R | SafeR | Safe R | Safe R | Safe R | Safe R | Safe R | Alexander (61.9%) |
| Texas | R+10 | John Cornyn | 54.8% | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Cornyn (61.6%) |
| Virginia | EVEN | Mark Warner | 65.0% | Likely D | Safe D | Safe D | Safe D | Lean D | Likely D | Likely D | Likely D | Warner (49.1%) |
| West Virginia | R+13 | Jay Rockefeller (retiring) | 63.7% | Likely R (flip) | Safe R (flip) | Safe R (flip) | Safe R (flip) | Likely R (flip) | Safe R (flip) | Safe R (flip) | Safe R (flip) | Capito (62.1%) (flip) |
| Wyoming | R+22 | Mike Enzi | 75.6% | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Safe R | Enzi (72.2%) |

## Alabama

Three-term incumbent Republican Jeff Sessions had been re-elected with 63% of the vote in 2008. Sessions sought re-election. Democrat Victor Sanchez Williams ran against Sessions as a write-in candidate. Sessions won with 97.3 percent of the vote against assorted write-in candidates.
2014 United States Senate election in Alabama :
| Party | Party | Candidate | Votes | % |
| | Republican | Jeff Sessions (Incumbent) | 795,606 | 97.25% |
| | Write-In | Write-in | 22,484 | 2.75% |
| Total votes | Total votes | Total votes | 818,090 | 100.00% |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## Alaska

One-term incumbent Democrat Mark Begich had been first elected with 48% of the vote in 2008, defeating six-term senator Ted Stevens by 3,953 votes (a margin of 1.25%). Begich was 52 years old in 2014 and was seeking re-election to a second term. Stevens, who would have been almost 91 years old at the time of the election, had already filed for a rematch back in 2009, but was killed in a plane crash the following year.
Republican lieutenant governor Mead Treadwell, 2010 nominee Joe Miller, State Natural Resources Commissioner Daniel S. Sullivan, and Air Force veteran John Jaramillo ran for the GOP nomination. In the August 19 primary, Sullivan won the Republican nomination with 40% and defeated Begich in the general election.

## Arkansas

Two-term incumbent Democrat Mark Pryor had been re-elected with 80% of the vote without Republican opposition in 2008. Pryor was running for a third term.
Freshman Representative Tom Cotton of Arkansas's 4th congressional district was the Republican nominee. In the general election, Cotton defeated Pryor.
Arkansas general election :
| Party | Party | Candidate | Votes | % |
| | Republican | Tom Cotton | 478,819 | 56.50% |
| | Democratic | Mark Pryor (Incumbent) | 334,174 | 39.43% |
| | Libertarian | Nathan LaFrance | 17,210 | 2.03% |
| | Green | Mark Swaney | 16,797 | 1.98% |
| | Write-ins | Others | 505 | 0.06% |
| Majority | Majority | Majority | 144,645 | 17.07% |
| Total votes | Total votes | Total votes | 847,505 | 100.00% |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

## Colorado

One-term incumbent Democrat Mark Udall had been elected with 53% of the vote in 2008. Udall was running for re-election.
Congressman Cory Gardner of Colorado's 4th congressional district was the Republican nominee; his late entry into the race caused numerous Republicans to withdraw their candidacies. Gaylon Kent was the Libertarian Party nominee. Unity Party of America founder and National Chairman Bill Hammons was the Unity Party nominee.
Colorado Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mark Udall (incumbent) | 213,746 | 100.00% |
| Total votes | Total votes | Total votes | 213,746 | 100.00% |
Colorado Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Cory Gardner | 338,324 | 100.00% |
| Total votes | Total votes | Total votes | 338,324 | 100.00% |
Colorado general election :
| Party | Party | Candidate | Votes | % |
| | Republican | Cory Gardner | 983,891 | 48.21% |
| | Democratic | Mark Udall (incumbent) | 944,203 | 46.26% |
| | Libertarian | Gaylon Kent | 52,876 | 2.59% |
| | Independent | Steve Shogan | 29,472 | 1.44% |
| | Independent | Raúl Acosta | 24,151 | 1.18% |
| | Unity | Bill Hammons | 6,427 | 0.32% |
| Total votes | Total votes | Total votes | 2,041,020 | 100.00% |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

## Delaware

Democrat Chris Coons won in the 2010 United States Senate special election in Delaware caused by Joe Biden's election as Vice President, winning by a 57% to 41% margin. Coons sought re-election. His Republican opponent was engineer Kevin Wade, whom Coons went on to defeat in the general election.
Delaware Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Kevin Wade | 18,181 | 75.66% |
| | Republican | Carl Smink | 5,848 | 24.34% |
| Total votes | Total votes | Total votes | 24,029 | 100.00% |
Delaware general election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Chris Coons (Incumbent) | 130,655 | 55.83% |
| | Republican | Kevin Wade | 98,823 | 42.23% |
| | Green | Andrew Groff | 4,560 | 1.95% |
| Total votes | Total votes | Total votes | 234,038 | 100.00% |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## Georgia

Two-term incumbent Republican Saxby Chambliss had been re-elected with 57% of the vote in 2008 in a runoff election with former state Representative Jim Martin; Georgia requires run-off elections when no Senate candidate wins over 50% of the vote. Chambliss did not seek a third term.
Political activist Derrick Grayson, Representatives Jack Kingston of Georgia's 1st congressional district, Paul Broun of Georgia's 10th congressional district, and Phil Gingrey of Georgia's 11th congressional district all declared their candidacy for the Republican nomination, as did former secretary of state Karen Handel. In the May 20 primary, no candidate received a majority of votes, so the top two candidates faced each other in a runoff; Perdue narrowly won against Kingston in the runoff primary election on July 22 with 50.9% of the vote.
Michelle Nunn, CEO of Points of Light and the daughter of former U.S. Senator Sam Nunn, won the Democratic nomination. Other declared Democratic candidates included former state senator Steen Miles, psychiatrist Branko Radulovacki, and former US Army Ranger Todd Robinson. Amanda Swafford, a former Flowery Branch, Georgia, city councilwoman, received the Libertarian Party of Georgia nomination.
Georgia Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | David Perdue | 185,466 | 30.64% |
| | Republican | Jack Kingston | 156,157 | 25.80% |
| | Republican | Karen Handel | 132,944 | 21.96% |
| | Republican | Phil Gingrey | 60,735 | 10.03% |
| | Republican | Paul Broun | 58,297 | 9.63% |
| | Republican | Derrick Grayson | 6,045 | 1.00% |
| | Republican | Art Gardner | 5,711 | 0.94% |
| Total votes | Total votes | Total votes | 605,355 | 100.00% |
Republican primary runoff :
| Party | Party | Candidate | Votes | % |
| | Republican | David Perdue | 245,951 | 50.88% |
| | Republican | Jack Kingston | 237,448 | 49.12% |
| Total votes | Total votes | Total votes | 483,399 | 100.00% |
Georgia Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Michelle Nunn | 246,369 | 74.95% |
| | Democratic | Steen Miles | 39,418 | 11.99% |
| | Democratic | Todd Robinson | 31,822 | 9.68% |
| | Democratic | Branko Radulovacki | 11,101 | 3.38% |
| Total votes | Total votes | Total votes | 328,710 | 100.00% |
Georgia general election :
| Party | Party | Candidate | Votes | % |
| | Republican | David Perdue | 1,358,088 | 52.9% |
| | Democratic | Michelle Nunn | 1,160,811 | 45.2% |
| | Libertarian | Amanda Swafford | 48,862 | 1.9% |
| Total votes | Total votes | Total votes | 2,567,761 | 100.0% |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## Hawaii (special)

Daniel Inouye, the second longest serving United States Senator in U.S. history, died on December 17, 2012, after respiratory complications. Hawaii law allows the Governor of Hawaii, to appoint an interim Senator "who serves until the next regularly-scheduled general election, chosen from a list of three prospective appointees that the prior incumbent's political party submits". Governor Neil Abercrombie did so, selecting Lieutenant Governor Brian Schatz to fill the Senate seat. Inouye had been re-elected in 2010 with 72% of the vote. Schatz was challenged in the Democratic primary by Congresswoman Colleen Hanabusa of Hawaii's 1st congressional district, who Inouye had hoped would be his successor. Schatz defeated Hanabusa in the primary with 48.5% to 47.8%.
Campbell Cavasso, former state representative and nominee for the U.S. Senate in 2004 and 2010, was the Republican nominee.
Hawaii Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Brian Schatz (incumbent) | 115,445 | 48.5% |
| | Democratic | Colleen Hanabusa | 113,663 | 47.7% |
| | Democratic | Brian Evans | 4,842 | 2.0% |
| | Democratic | Blank vote | 3,842 | 1.6% |
| | Democratic | Over vote | 150 | 0.2% |
| Total votes | Total votes | Total votes | 237,942 | 100.0% |
Hawaii Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Campbell Cavasso | 25,874 | 59.00% |
| | Republican | John P. Roco | 4,425 | 10.00% |
| | Republican | Harry J. Friel, Jr. | 3,477 | 8.00% |
| | Republican | Eddie Pirkowski | 2,033 | 5.00% |
| | Republican | Blank vote | 8,306 | 18.00% |
| | Republican | Over vote | 34 | 0.08% |
| Total votes | Total votes | Total votes | 44,149 | 100.00% |
Hawaii Libertarian primary election :
| Party | Party | Candidate | Votes | % |
| | Libertarian | Michael Kokoski | 568 | 79.89% |
| | Libertarian | Blank vote | 143 | 20.11% |
| Total votes | Total votes | Total votes | 711 | 100.00% |
Hawaii Independent primary election :
| Party | Party | Candidate | Votes | % |
| | Independent | Joy Allison | 388 | 34.8% |
| | Independent | Arturo Pacheco Reyes | 184 | 16.5% |
| | Independent | Blank vote | 540 | 48.4% |
| | Independent | Over vote | 3 | 0.3% |
| Total votes | Total votes | Total votes | 1,115 | 100.0% |
Hawaii special election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Brian Schatz (incumbent) | 246,827 | 69.8% |
| | Republican | Campbell Cavasso | 98,006 | 27.7% |
| | Libertarian | Michael Kokoski | 8,941 | 2.5% |
| Total votes | Total votes | Total votes | 353,774 | 100.0% |

## Idaho

One-term incumbent Republican Jim Risch had been elected with 58% of the vote in 2008. Risch sought a second term.
Boise attorney Nels Mitchell was the Democratic nominee.
Idaho Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Risch (incumbent) | 118,927 | 79.91% |
| | Republican | Jeremy Anderson | 29,897 | 20.09% |
| Total votes | Total votes | Total votes | 148,824 | 100.00% |
Idaho Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Nels Mitchell | 16,905 | 69.6% |
| | Democratic | William Bryk | 7,383 | 30.4% |
| Total votes | Total votes | Total votes | 24,288 | 100.0% |
Idaho general election :
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Risch (Incumbent) | 285,596 | 65.33% |
| | Democratic | Nels Mitchell | 151,574 | 34.67% |
| Majority | Majority | Majority | 134,022 | 30.66% |
| Total votes | Total votes | Total votes | 437,170 | 100.00% |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## Illinois

Three-term incumbent and Senate Majority Whip Democrat Dick Durbin had been re-elected with 68% of the vote in 2008. Durbin ran for a fourth term.
State Senator Jim Oberweis was the Republican nominee. He defeated primary challenger Doug Truax with 56% of the vote.
Illinois Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Dick Durbin (Incumbent) | 429,031 | 100.00% |
| Total votes | Total votes | Total votes | 429,031 | 100.00% |
Illinois Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Oberweis | 423,097 | 56.08% |
| | Republican | Doug Truax | 331,237 | 43.91% |
| | Republican | Write-in | 54 | <0.01% |
| Total votes | Total votes | Total votes | 754,388 | 100.00% |
Illinois general election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Dick Durbin (Incumbent) | 1,929,637 | 53.55% |
| | Republican | Jim Oberweis | 1,538,522 | 42.69% |
| | Libertarian | Sharon Hansen | 135,316 | 3.76% |
| | Write-In | Various candidates | 44 | 0.00% |
| Majority | Majority | Majority | 391,115 | 10.85% |
| Total votes | Total votes | Total votes | 3,603,519 | 100.00% |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## Iowa

Five-term incumbent Democrat Tom Harkin had been re-elected with 63% of the vote in 2008. Harkin announced on January 26, 2013, that he would not seek a sixth term. Congressman Bruce Braley was the Democratic nominee.
State Senator Joni Ernst was the Republican nominee.
Doug Butzier, who was the Libertarian Party's nominee, died in a plane crash on October 13, 2014, but still appeared on the ballot.
Iowa Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Bruce Braley | 62,623 | 99.2% |
| | Democratic | Write-ins | 504 | 0.8% |
| Total votes | Total votes | Total votes | 63,127 | 100.0% |
Iowa Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Joni Ernst | 88,692 | 56.12% |
| | Republican | Sam Clovis | 28,434 | 17.99% |
| | Republican | Mark Jacobs | 26,582 | 16.82% |
| | Republican | Matthew Whitaker | 11,909 | 7.54% |
| | Republican | Scott Schaben | 2,270 | 1.44% |
| | Republican | Write-ins | 144 | 0.09% |
| Total votes | Total votes | Total votes | 158,031 | 100.00% |
2014 Iowa U.S. Senator general election :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Joni Ernst | 588,575 | 52.1% | +14.8% |
| | Democratic | Bruce Braley | 494,370 | 43.8% | −18.9% |
| | Independent | Rick Stewart | 26,815 | 2.4% | +2.4% |
| | Libertarian | Douglas Butzier | 8,232 | 0.7% | +0.7% |
| | Independent | Bob Quast | 5,873 | 0.5% | +0.5% |
| | Independent | Ruth Smith | 4,724 | 0.4% | +0.4% |
| | Other | Write-Ins | 1,111 | 0.1% | +0.02% |
| Majority | Majority | Majority | 94,205 | 8.3% | |
| Turnout | Turnout | Turnout | 1,129,700 | | |
| | Republican gain from Democratic | Republican gain from Democratic | Swing | | |

## Kansas

Three-term incumbent Republican Pat Roberts had been re-elected with 60% of the vote in 2008. Roberts sought a fourth term. He faced a primary challenge from radiologist Milton Wolf, a conservative Tea Party supporter. Roberts defeated Wolf in the Republican primary by 48% to 41%. Shawnee County District Attorney Chad Taylor won the Democratic nomination. Randall Batson from Wichita was on the general election ballot as a Libertarian. Also, Greg Orman qualified for the ballot as an independent.
On September 3, Taylor announced he was dropping out of the election, leading to speculation that Democrats would support Orman's candidacy. On September 18, the Kansas Supreme Court ruled that Taylor's name had to be removed from the ballot.
Kansas Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Pat Roberts (incumbent) | 127,089 | 48.08% |
| | Republican | Milton Wolf | 107,799 | 40.78% |
| | Republican | D.J. Smith | 15,288 | 5.78% |
| | Republican | Alvin E. Zahnter | 13,935 | 5.26% |
| Total votes | Total votes | Total votes | 264,340 | 100.00% |
Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Chad Taylor | 35,067 | 53.3% |
| | Democratic | Patrick Wiesner | 30,752 | 46.7% |
| Total votes | Total votes | Total votes | 65,819 | 100.0% |
2014 Kansas's US Senate election :
| Party | Party | Candidate | Votes | % |
| | Republican | Pat Roberts (incumbent) | 460,350 | 53.15% |
| | Independent | Greg Orman | 368,372 | 42.53% |
| | Libertarian | Randall Batson | 37,469 | 4.32% |
| Total votes | Total votes | Total votes | 866,191 | 100.00% |

## Kentucky

Five-term Republican incumbent and Senate Minority Leader Mitch McConnell had been re-elected with 53% of the vote in 2008. McConnell sought re-election to a sixth term. McConnell defeated businessman Matt Bevin in the Republican primary on May 20.
Kentucky Secretary of State Alison Lundergan Grimes, with support from much of Kentucky's Democratic leadership, won the Democratic primary. Actress Ashley Judd publicly claimed to be considering a run for the Democratic nomination, but ultimately decided against it.
Ed Marksberry pursued an independent bid after dropping out of the Democratic field in September 2013.
Kentucky Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Mitch McConnell (incumbent) | 213,753 | 60.19% |
| | Republican | Matt Bevin | 125,787 | 35.42% |
| | Republican | Shawna Sterling | 7,214 | 2.03% |
| | Republican | Chris Payne | 5,338 | 1.51% |
| | Republican | Brad Copas | 3,024 | 0.85% |
| Total votes | Total votes | Total votes | 355,116 | 100.00% |
Kentucky Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Alison Lundergan Grimes | 307,821 | 76.47% |
| | Democratic | Greg Leichty | 32,602 | 8.10% |
| | Democratic | Burrel Farnsley | 32,310 | 8.03% |
| | Democratic | Tom Recktenwald | 29,791 | 7.40% |
| Total votes | Total votes | Total votes | 402,524 | 100.00% |

## Louisiana

Three-term incumbent Democrat Mary Landrieu had been re-elected with 52% of the vote in 2008. Landrieu ran for a fourth term.
Louisiana uses a unique jungle primary system that eschews primaries in favor of run-off elections between the top two candidates; this run-off can be avoided if the winning candidate receives over 50% of the vote. Democrats Wayne Ables, Vallian Senegal, and William Waymire ran against Landrieu in the election, as did Republicans Bill Cassidy (representative of Louisiana's 6th congressional district), Thomas Clements (small business owner), and retired Air Force Colonel Rob Maness. Electrical Engineer Brannon McMorris ran as a Libertarian.
Because Republican candidate Maness took almost 14% of the votes in the primary, there was a runoff election on December 6, 2014, between Landrieu (42%) and Cassidy (41%). Cassidy won the runoff with 56% of the vote.
Louisiana jungle primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mary Landrieu (Incumbent) | 619,402 | 42.08% |
| | Republican | Bill Cassidy | 603,048 | 40.97% |
| | Republican | Rob Maness | 202,556 | 13.76% |
| | Republican | Thomas Clements | 14,173 | 0.96% |
| | Libertarian | Brannon McMorris | 13,034 | 0.89% |
| | Democratic | Wayne Ables | 11,323 | 0.77% |
| | Democratic | William Waymire | 4,673 | 0.32% |
| | Democratic | Vallian Senegal | 3,835 | 0.26% |
| Total votes | Total votes | Total votes | 1,473,826 | 100.00% |
United States Senate election runoff in Louisiana, 2014 :
| Party | Party | Candidate | Votes | % |
| | Republican | Bill Cassidy | 712,379 | 55.93% |
| | Democratic | Mary Landrieu (Incumbent) | 561,210 | 44.07% |
| Total votes | Total votes | Total votes | 1,273,589 | 100.00% |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

## Maine

Three-term incumbent Republican Susan Collins was seeking a fourth term. Shenna Bellows, former executive director of the American Civil Liberties Union of Maine, was the Democratic nominee.
Maine Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Susan Collins (Incumbent) | 59,767 | 100.00% |
| Total votes | Total votes | Total votes | 59,767 | 100.00% |
Maine Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Shenna Bellows | 65,085 | 100.00% |
| Total votes | Total votes | Total votes | 65,085 | 100.00% |
Maine general election :
| Party | Party | Candidate | Votes | % |
| | Republican | Susan Collins (Incumbent) | 413,495 | 68.46% |
| | Democratic | Shenna Bellows | 190,244 | 31.50% |
| | Others | | 269 | 0.04% |
| Total votes | Total votes | Total votes | 604,008 | 100.00% |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## Massachusetts

Five-term incumbent and 2004 Democratic presidential nominee John Kerry had been re-elected with 66% of the vote in 2008. Kerry resigned in early 2013 to become U.S. Secretary of State. Governor Deval Patrick appointed Democrat Mo Cowan to the seat. Democratic Congressman Ed Markey beat Republican Gabriel E. Gomez in the June 25, 2013 special election by a 55% to 45% margin. Markey had served the remainder of Kerry's term before running for re-election to a first full term in 2014. Hopkinton Town Selectman Brian Herr was the Republican nominee.
General election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Ed Markey (Incumbent) | 1,285,736 | 61.96% |
| | Republican | Brian Herr | 789,378 | 38.04% |
| Total votes | Total votes | Total votes | 2,075,114 | 100.00% |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## Michigan

Six-term incumbent senator and Chairman of the Armed Services Committee Democrat Carl Levin, the longest-serving senator in Michigan's history, had been re-elected with 63% of the vote in 2008. Levin announced on March 7, 2013, that he would not seek re-election.
Three-term Democratic representative Gary Peters of MI-14 was the Democratic nominee. He defeated Republican former secretary of state Terri Lynn Land who was unopposed for the Republican nomination.
Michigan Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Gary Peters | 504,102 | 100.00% |
| Total votes | Total votes | Total votes | 504,102 | 100.00% |
Michigan Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Terri Lynn Land | 588,084 | 100.00% |
| Total votes | Total votes | Total votes | 588,084 | 100.00% |
Michigan general election :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | Gary Peters | 1,704,936 | 54.6% | −8.1% |
| | Republican | Terri Lynn Land | 1,290,199 | 41.3% | +7.5% |
| | Libertarian | Jim Fulner | 62,897 | 2.0% | +.4% |
| | Green | Chris Wahmhoff | 26,137 | 0.9% | 0 |
| | U.S. Taxpayers | Richard Matkin | 37,529 | 1.2% | +.6% |
| | | Write-Ins | 77 | 0.0% | 0.0% |
| Majority | Majority | Majority | 414,737 | | |
| Turnout | Turnout | Turnout | 3,121,775 | | |
| | Democratic hold | Democratic hold | Swing | | |

## Minnesota

One-term incumbent Democrat Al Franken unseated one-term Republican Norm Coleman by 312 votes in a contested three-way race with 42% of the vote in 2008; the third candidate in the race, former senator Dean Barkley of the Independence Party of Minnesota, won 15% of the vote. Franken sought re-election. State Representative Jim Abeler, St. Louis County Commissioner Chris Dahlberg, co-CEO of Lazard Middle Market Mike McFadden, bison farmer and former hair salon owner Monti Moreno, state Senator Julianne Ortman, and U.S. Navy reservist Phillip Parrish ran for the Republican nomination. McFadden won the Republican primary and was the Republican nominee in the general election.
Hannah Nicollet of the Independence Party of Minnesota also ran.
Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic (DFL) | Al Franken (Incumbent) | 182,720 | 94.5% |
| | Democratic (DFL) | Sandra Henningsgard | 10,627 | 5.5% |
| Total votes | Total votes | Total votes | 193,347 | 100.0% |
Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Mike McFadden (endorsed) | 129,601 | 71.74% |
| | Republican | Jim Abeler | 26,714 | 14.79% |
| | Republican | David Carlson | 16,449 | 9.10% |
| | Republican | Patrick Munro | 5,058 | 2.80% |
| | Republican | Ole Savior | 2,840 | 1.57% |
| Total votes | Total votes | Total votes | 180,662 | 100.00% |
Independence primary election :
| Party | Party | Candidate | Votes | % |
| | Independence | Steve Carlson | 2,148 | 33.91% |
| | Independence | Kevin Terrell (endorsed) | 1,376 | 21.72% |
| | Independence | Jack Shepard | 1,130 | 17.83% |
| | Independence | Stephen Williams | 862 | 13.60% |
| | Independence | Tom Books | 820 | 12.94% |
| Total votes | Total votes | Total votes | 6,336 | 100.00% |
Minnesota general election :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic (DFL) | Al Franken (Incumbent) | 1,053,205 | 53.15% | +11.16% |
| | Republican | Mike McFadden | 850,227 | 42.91% | +0.93% |
| | Independence | Steve Carlson | 47,530 | 2.40% | −12.75% |
| | Libertarian | Heather Johnson | 29,685 | 1.50% | +1.02% |
| | Write-ins | Others | 881 | 0.04% | |
| Majority | Majority | Majority | 202,978 | 10.24% | |
| Total votes | Total votes | Total votes | 1,981,528 | | |
| | Democratic (DFL) hold | Democratic (DFL) hold | Swing | | |

## Mississippi

Six-term incumbent Republican Thad Cochran, re-elected with 62% of the vote in 2008, ran for re-election. Cochran was the last incumbent senator to declare his plans, leading to widespread speculation that he might announce his retirement. Tea Party candidate Chris McDaniel, a conservative Mississippi state senator, ran against Cochran in the Republican primary. Neither McDaniel nor Cochran was able to get 50% of the vote in the first round of the primary, so a runoff election was held June 24. Cochran won the runoff election by 51% to 49%, with the help of Democratic voters eligible to vote in the state's open primaries who chose Cochran as their preferred Republican. McDaniel filed a lawsuit to challenge the results of the run-off, but the challenge was rejected on appeal by the Supreme Court of Mississippi.
Former Congressman Travis Childers was the Democratic nominee.
Mississippi Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Chris McDaniel | 157,733 | 49.5% |
| | Republican | Thad Cochran (incumbent) | 156,315 | 49.0% |
| | Republican | Thomas Carey | 4,854 | 1.5% |
| Total votes | Total votes | Total votes | 318,902 | 100.0% |
Mississippi Republican primary election runoff :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Thad Cochran (incumbent) | 194,932 | 51.00% | +2.00% |
| | Republican | Chris McDaniel | 187,265 | 49.00% | −0.50% |
| Total votes | Total votes | Total votes | 382,197 | 100.00% | 0.00% |
Mississippi Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Travis Childers | 63,548 | 73.9% |
| | Democratic | Bill Marcy | 10,361 | 12.1% |
| | Democratic | William Compton | 8,465 | 9.9% |
| | Democratic | Jonathan Rawl | 3,492 | 4.1% |
| Total votes | Total votes | Total votes | 85,866 | 100.0% |
Mississippi general election :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Thad Cochran (Incumbent) | 378,481 | 59.90% | −1.54% |
| | Democratic | Travis Childers | 239,439 | 37.89% | −0.67% |
| | Reform | Shawn O'Hara | 13,938 | 2.21% | +2.21% |
| Total votes | Total votes | Total votes | 631,858 | 100.00% | |
| | Republican hold | Republican hold | Swing | −0.87% | |

## Montana

Six-term incumbent Democrat Max Baucus, the longest-serving senator in Montana's history, had been re-elected with 73% of the vote in 2008. Baucus announced on April 23, 2013, that he would retire in 2014, rather than seek re-election to a seventh term. Baucus was appointed as the United States Ambassador to China, leading him to resign from the Senate in February 2014.
Following Baucus's confirmation as ambassador, Governor Steve Bullock appointed the Lieutenant Governor John Walsh to fill the vacant senate seat. Former lieutenant governor John Bohlinger was defeated by Walsh in the Democratic primary. Amid controversy over alleged plagiarism in a 2007 research paper, Walsh pulled out of the race. The Montana Democratic Party held a special nominating convention on August 16 to choose a replacement for Walsh. First-term state representative Amanda Curtis won the nomination, thereby becoming the new Democratic nominee.
Congressman Steve Daines won the Republican nomination over state Representative Champ Edmunds of Missoula and David Leaser of Kalispell.
Montana Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | John Walsh (incumbent) | 48,665 | 64.04% |
| | Democratic | John Bohlinger | 17,187 | 22.62% |
| | Democratic | Dirk Adams | 10,139 | 13.34% |
| Total votes | Total votes | Total votes | 75,991 | 100.00% |
Montana Democratic convention :
| Party | Party | Candidate | Votes | % |
| | Democratic | Amanda Curtis | 82 | 64.0% |
| | Democratic | Dirk Adams | 46 | 36.0% |
| Total votes | Total votes | Total votes | 128 | 100.0% |
Montana Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Steve Daines | 110,565 | 83.37% |
| | Republican | Susan Cundiff | 11,909 | 8.98% |
| | Republican | Champ Edmunds | 10,151 | 7.65% |
| Total votes | Total votes | Total votes | 132,625 | 100.00% |
2014 Montana's US Senate election :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Steve Daines | 213,709 | 57.79% | +30.71% |
| | Democratic | Amanda Curtis | 148,184 | 40.07% | −32.85% |
| | Libertarian | Roger Roots | 7,933 | 2.14% | n/a |
| Majority | Majority | Majority | 65,525 | 17.72% | +63.56% |
| Turnout | Turnout | Turnout | 369,826 | 100.00% | |
| | Republican gain from Democratic | Republican gain from Democratic | Swing | | |

## Nebraska

One-term incumbent Republican Mike Johanns had been elected with 58% of the vote in 2008. He did not seek a second term. Term-limited Republican governor Dave Heineman considered running for the Republican nomination, but ultimately decided not to do so. Former state Treasurer Shane Osborn, attorney Bart McLeay, banker Sid Dinsdale, and Midland University President Ben Sasse ran for the Republican nomination. In the May 13 primary, Sasse won the Republican nomination.
Trial lawyer David Domina was the Democratic nominee.
Nebraska Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Ben Sasse | 109,847 | 49.37% |
| | Republican | Sid Dinsdale | 49,832 | 22.39% |
| | Republican | Shane Osborn | 46,856 | 21.06% |
| | Republican | Bart McLeay | 12,700 | 5.71% |
| | Republican | Clifton Johnson | 3,285 | 1.48% |
| Total votes | Total votes | Total votes | 222,520 | 100.00% |
Nebraska Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | David Domina | 44,813 | 67.46% |
| | Democratic | Larry Marvin | 21,615 | 32.54% |
| Total votes | Total votes | Total votes | 66,428 | 100.00% |
Nebraska general election :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Ben Sasse | 347,636 | 64.39% | +6.90% |
| | Democratic | Dave Domina | 170,127 | 31.51% | −8.60% |
| | By Petition | Jim Jenkins | 15,868 | 2.94% | n/a |
| | By Petition | Todd Watson | 6,260 | 1.16% | n/a |
| Majority | Majority | Majority | 177,509 | | |
| Turnout | Turnout | Turnout | 539,891 | | |
| | Republican hold | Republican hold | Swing | | |

## New Hampshire

One-term incumbent Democrat Jeanne Shaheen had been elected with 52% of the vote in 2008. Shaheen ran for re-election. Shaheen defeated Republican nominee Scott Brown, who had represented neighboring Massachusetts in the Senate from 2010 to 2013.
New Hampshire Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jeanne Shaheen (Incumbent) | 74,504 | 100.00% |
New Hampshire Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Scott Brown | 58,775 | 49.86% |
| | Republican | Jim Rubens | 27,089 | 22.98% |
| | Republican | Bob Smith | 26,593 | 22.56% |
| | Republican | Walter W. Kelly | 1,376 | 1.17% |
| | Republican | Bob Heghmann | 784 | 0.67% |
| | Republican | Andy Martin | 734 | 0.62% |
| | Republican | Mark W. Farnham | 733 | 0.62% |
| | Republican | Miroslaw "Miro" Dziedzic | 508 | 0.43% |
| | Republican | Gerard Beloin | 492 | 0.42% |
| | Republican | Robert D'Arcy | 397 | 0.34% |
| | Democratic | Jeanne Shaheen (write-in) | 220 | 0.19% |
| | | Scatter | 183 | 0.16% |
| Total votes | Total votes | Total votes | 117,884 | 100.00% |
New Hampshire general election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jeanne Shaheen (Incumbent) | 251,184 | 51.46% |
| | Republican | Scott Brown | 235,347 | 48.21% |
| | None | Scatter | 1,628 | 0.33% |
| Total votes | Total votes | Total votes | 488,159 | 100.00% |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## New Jersey

Incumbent Democrat Frank Lautenberg had been re-elected with 56% of the vote in 2008. After announcing he would not seek re-election, Lautenberg died in June 2013, aged 89, after a long period of ill health.
Newark Mayor Cory Booker, a Democrat, defeated Republican nominee Steve Lonegan by 55%-to-45% in a 2013 special election to replace interim Republican appointee Jeffrey Chiesa. Booker ran for re-election to a full term in 2014. 1978 and 1982 Republican candidate and political operative Jeff Bell was the Republican nominee.
New Jersey Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Cory Booker (Incumbent) | 197,158 | 100.00% |
| Total votes | Total votes | Total votes | 197,158 | 100.00% |
New Jersey Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Jeff Bell | 42,728 | 29.41% |
| | Republican | Richard J. Pezzullo | 38,130 | 26.24% |
| | Republican | Brian D. Goldberg | 36,266 | 24.96% |
| | Republican | Murray Sabrin | 28,183 | 19.40% |
| Total votes | Total votes | Total votes | 145,307 | 100.00% |
New Jersey general election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Cory Booker (Incumbent) | 1,043,866 | 55.84% |
| | Republican | Jeff Bell | 791,297 | 42.33% |
| | Libertarian | Joseph Baratelli | 16,721 | 0.89% |
| | Economic Growth | Hank Schroeder | 5,704 | 0.31% |
| | Independent | Jeff Boss | 4,513 | 0.24% |
| | Democratic-Republican | Eugene Martin Lavergne | 3,890 | 0.21% |
| | Independent | Antonio N. Sabas | 3,544 | 0.19% |
| Total votes | Total votes | Total votes | 1,869,535 | 100.00% |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## New Mexico

One-term incumbent Democrat Tom Udall had been elected with 61% of the vote in 2008. Former Doña Ana County Republican Party Chairman David Clements and former New Mexico Republican Party Chairman Allen Weh sought the Republican nomination. Weh won the June 3 primary but lost to Udall in the general election.
New Mexico Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Tom Udall (Incumbent) | 113,502 | 100.00% |
| Total votes | Total votes | Total votes | 113,502 | 100.00% |
New Mexico Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Allen Weh | 41,566 | 63.0% |
| | Republican | David Clements | 24,413 | 37.0% |
| Total votes | Total votes | Total votes | 65,979 | 100.0% |
New Mexico general election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Tom Udall (Incumbent) | 286,409 | 55.56% |
| | Republican | Allen Weh | 229,097 | 44.44% |
| Total votes | Total votes | Total votes | 515,506 | 100.00% |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## North Carolina

One-term incumbent Democrat Kay Hagan had been elected with 53% of the vote against incumbent Republican Elizabeth Dole in 2008. Hagan was seeking re-election.
State House Speaker Thom Tillis was the Republican nominee. Sean Haugh won the Libertarian nomination.
North Carolina Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Kay Hagan (Incumbent) | 372,209 | 77.16% |
| | Democratic | Will Stewart | 66,903 | 13.87% |
| | Democratic | Ernest T. Reeves | 43,257 | 8.97% |
| Total votes | Total votes | Total votes | 482,579 | 100.00% |
North Carolina Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Thom Tillis | 223,174 | 45.68% |
| | Republican | Greg Brannon | 132,630 | 27.15% |
| | Republican | Mark Harris | 85,727 | 17.55% |
| | Republican | Heather Grant | 22,971 | 4.70% |
| | Republican | Jim Snyder | 9,414 | 1.93% |
| | Republican | Ted Alexander | 9,258 | 1.89% |
| | Republican | Alex Lee Bradshaw | 3,528 | 0.72% |
| | Republican | Edward Kryn | 1,853 | 0.38% |
| Total votes | Total votes | Total votes | 488,555 | 100.00% |
North Carolina Libertarian primary election :
| Party | Party | Candidate | Votes | % |
| | Libertarian | Sean Haugh | 1,226 | 60.69% |
| | Libertarian | Tim D'Annunzio | 794 | 39.31% |
| Total votes | Total votes | Total votes | 2,020 | 100.00% |
North Carolina general election :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Thom Tillis | 1,423,259 | 48.82% | +4.64% |
| | Democratic | Kay Hagan (incumbent) | 1,377,651 | 47.26% | −5.39% |
| | Libertarian | Sean Haugh | 109,100 | 3.74% | +0.62% |
| | Other | Write-ins | 5,271 | 0.18% | +0.14% |
| Plurality | Plurality | Plurality | 45,608 | 1.56% | |
| Turnout | Turnout | Turnout | 2,915,281 | +5.0% | |
| | Republican gain from Democratic | Republican gain from Democratic | Swing | | |

## Oklahoma

There were 2 elections in Oklahoma, due to the resignation of Tom Coburn.

### Oklahoma (regular)

Three-term incumbent Republican Jim Inhofe had been re-elected with 57% of the vote in 2008. Inhofe sought re-election. Matt Silverstein, an insurance agency owner, ran for the Democratic nomination.
Oklahoma Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Inhofe (incumbent) | 231,291 | 87.69% |
| | Republican | Evelyn Rodgers | 11,960 | 4.53% |
| | Republican | Erick Wyatt | 11,713 | 4.44% |
| | Republican | Rob Moye | 4,846 | 1.84% |
| | Republican | D. Jean McBride-Samuels | 3,965 | 1.50% |
| Total votes | Total votes | Total votes | 263,775 | 100.00% |
Oklahoma US Senate Election, 2014 :
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Inhofe (Incumbent) | 558,166 | 68.01% |
| | Democratic | Matt Silverstein | 234,307 | 28.55% |
| | Independent | Joan Farr | 10,554 | 1.29% |
| | Independent | Ray Woods | 9,913 | 1.21% |
| | Independent | Aaron DeLozier | 7,793 | 0.94% |
| Total votes | Total votes | Total votes | 820,733 | 100.00% |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### Oklahoma (special)

Two-term incumbent Republican Tom Coburn had been re-elected with 71% of the vote in 2010, and was not scheduled to be up for election again until 2016. However, Coburn announced his intention to resign at the end of the 113th Congress. A special election to fill his seat took place in November 2014, concurrent with the other Senate elections. Congressman James Lankford was the Republican nominee. State Senator Connie Johnson was the Democratic nominee.
Oklahoma Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | James Lankford | 152,749 | 57.24% |
| | Republican | T.W. Shannon | 91,854 | 34.42% |
| | Republican | Randy Brogdon | 12,934 | 4.85% |
| | Republican | Kevin Crow | 2,828 | 1.06% |
| | Republican | Andy Craig | 2,427 | 0.91% |
| | Republican | Eric McCray | 2,272 | 0.85% |
| | Republican | Jason Weger | 1,794 | 0.67% |
| Total votes | Total votes | Total votes | 266,858 | 100.00% |
Oklahoma Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Constance N. Johnson | 71,462 | 43.84% |
| | Democratic | Jim Rogers | 57,598 | 35.34% |
| | Democratic | Patrick Hayes | 33,943 | 20.82% |
| Total votes | Total votes | Total votes | 163,003 | 100.00% |
Oklahoma Democratic primary runoff election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Constance N. Johnson | 54,762 | 57.99% |
| | Democratic | Jim Rogers | 39,664 | 42.01% |
| Total votes | Total votes | Total votes | 94,426 | 100.00% |
Oklahoma special election :
| Party | Party | Candidate | Votes | % |
| | Republican | James Lankford | 557,002 | 67.85% |
| | Democratic | Connie Johnson | 237,923 | 28.98% |
| | Independent | Mark T. Beard | 25,965 | 3.17% |
| Total votes | Total votes | Total votes | 820,890 | 100.00% |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## Oregon

One-term incumbent Democrat Jeff Merkley was narrowly elected with 49% of the vote in 2008. Merkley was running for a second term. State representative Jason Conger, attorney Tim Crawley, IT consultant Mark Callahan, neurosurgeon Dr. Monica Wehby, and former Linn County Republican Chair Jo Rae Perkins all ran for the Republican nomination, with Wehby ultimately winning the nomination in the May 20 primary.
Oregon Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jeff Merkley (incumbent) | 277,120 | 92.04% |
| | Democratic | William Bryk | 11,330 | 3.76% |
| | Democratic | Pavel Goberman | 8,436 | 2.81% |
| | | write-ins | 4,194 | 1.39% |
| Total votes | Total votes | Total votes | 301,080 | 100.00% |
Oregon Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Monica Wehby | 134,627 | 49.96% |
| | Republican | Jason Conger | 101,401 | 37.63% |
| | Republican | Mark Callahan | 18,220 | 6.76% |
| | Republican | Jo Rae Perkins | 7,602 | 2.82% |
| | Republican | Tim Crawley | 6,566 | 2.44% |
| | | write-ins | 1,027 | 0.39% |
| Total votes | Total votes | Total votes | 266,438 | 100.00% |
Oregon general election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jeff Merkley (incumbent) | 814,537 | 55.72% |
| | Republican | Monica Wehby | 538,847 | 36.87% |
| | Libertarian | Mike Monchalin | 44,916 | 3.07% |
| | Pacific Green | Christina Jean Lugo | 32,434 | 2.22% |
| | Constitution | James E. Leuenberger | 24,212 | 1.66% |
| | | write-ins | 6,672 | 0.46% |
| Total votes | Total votes | Total votes | 1,461,618 | 100.00% |
| | Democratic hold | Swing | | |

## Rhode Island

Three-term incumbent Democrat Jack Reed had been re-elected with 73% of the vote in 2008. Reed defeated Republican nominee Mark Zaccaria in the 2014 election.
Rhode Island Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jack Reed | 98,610 | 100.00% |
Rhode Island Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Mark Zaccaria | 23,780 | 100.00% |
Rhode Island general election :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | Jack Reed (Incumbent) | 223,675 | 70.6% | −2.5% |
| | Republican | Mark Zaccaria | 92,684 | 29.2% | +2.7% |
| | | write-ins | 539 | 0.2% | |
| Majority | Majority | Majority | 130,991 | | |
| Turnout | Turnout | Turnout | 316,898 | | |
| | Democratic hold | Democratic hold | Swing | -5.3% | |

## South Carolina

There were 2 elections in South Carolina, due to the resignation of Jim DeMint.

### South Carolina (regular)

Two-term Republican Lindsey Graham had been re-elected with 58% of the vote in 2008. Graham won the Republican nomination over a field that included state senator Lee Bright. State Senator Brad Hutto won the Democratic nomination.
South Carolina Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Lindsey Graham (incumbent) | 178,833 | 56.42% |
| | Republican | Lee Bright | 48,904 | 15.53% |
| | Republican | Richard Cash | 26,325 | 8.30% |
| | Republican | Det Bowers | 23,172 | 7.31% |
| | Republican | Nancy Mace | 19,634 | 6.19% |
| | Republican | Bill Connor | 16,912 | 5.34% |
| | Republican | Benjamin Dunn | 3,209 | 1.01% |
| Total votes | Total votes | Total votes | 316,989 | 100.00% |
South Carolina Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Brad Hutto | 87,552 | 76.65% |
| | Democratic | Jay Stamper | 26,678 | 23.35% |
| Total votes | Total votes | Total votes | 114,230 | 100.00% |
South Carolina general election :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Lindsey Graham (incumbent) | 672,941 | 54.27% | −3.25% |
| | Democratic | Brad Hutto | 456,726 | 36.83% | −5.42% |
| | Working Families | Brad Hutto | 24,207 | 1.95% | +1.95% |
| | Independent | Thomas Ravenel | 47,588 | 3.84% | +3.84% |
| | Libertarian | Victor Kocher | 33,839 | 2.73% | +2.73% |
| | | Write-ins | 4,774 | 0.38% | +0.15% |
| Majority | Majority | Majority | 192,008 | 15.49% | +0.22% |
| Turnout | Turnout | Turnout | 1,240,075 | 43.04% | −30.24% |
| | Republican hold | Republican hold | Swing | | |

### South Carolina (special)

Jim DeMint had been elected to a second term in 2010, but resigned from the Senate in January 2013 to become president of The Heritage Foundation, a conservative think-tank. Governor Nikki Haley appointed Congressman Tim Scott as DeMint's replacement. Scott, an African-American, was the Republican nominee to serve out the remainder of DeMint's term. Scott is the first African-American Republican since shortly after Reconstruction to represent a Southern state. Richland County Councilwoman Joyce Dickerson won the Democratic nomination.
South Carolina Republican special primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Tim Scott (incumbent) | 276,147 | 89.98% |
| | Republican | Randall Young | 30,741 | 10.02% |
| Total votes | Total votes | Total votes | 306,888 | 100.00% |
South Carolina Democratic special primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Joyce Dickerson | 72,874 | 65.39% |
| | Democratic | Sidney Moore | 26,310 | 23.61% |
| | Democratic | Harry Pavilack | 11,886 | 11.06% |
| Total votes | Total votes | Total votes | 111,437 | 100.00% |
South Carolina special election :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Tim Scott (Incumbent) | 757,215 | 61.12% | −0.36% |
| | Democratic | Joyce Dickerson | 459,583 | 37.09% | +9.44% |
| | Independent | Jill Bossi | 21,652 | 1.75% | |
| | Other | Write-Ins | 532 | 0.04% | −1.62% |
| Majority | Majority | Majority | 297,632 | 24.03% | −9.80% |
| Turnout | Turnout | Turnout | 1,238,982 | 43.00% | −7.12% |
| | Republican hold | Republican hold | Swing | | |

## South Dakota

Three-term incumbent Democrat Tim Johnson had been re-elected with 63% of the vote in 2008. Johnson announced on March 26, 2013, that he would not run for re-election. Former Congressional aide Rick Weiland was the Democratic nominee.
Among Republicans, former two-term governor Mike Rounds announced his candidacy for the GOP nomination on November 29, 2012. Rounds won the Republican nomination over state senator Larry Rhoden, state representative Stace Nelson, and physician Annette Bosworth.
Former Republican U.S. Senator Larry Pressler and Republican State Senator Gordon Howie ran as independents. Pressler did not commit to caucusing with either party, while Howie said he would caucus with the Senate Republicans.
South Dakota Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Mike Rounds | 41,377 | 55.54% |
| | Republican | Larry Rhoden | 13,593 | 18.25% |
| | Republican | Stace Nelson | 13,179 | 17.69% |
| | Republican | Annette Bosworth | 4,283 | 5.75% |
| | Republican | Jason Ravnsborg | 2,066 | 2.77% |
| Total votes | Total votes | Total votes | 74,490 | 100.00% |
South Dakota general election :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Mike Rounds | 140,741 | 50.37% | +12.86% |
| | Democratic | Rick Weiland | 82,456 | 29.51% | −32.98% |
| | Independent | Larry Pressler | 47,741 | 17.09% | N/A |
| | Independent | Gordon Howie | 8,474 | 3.03% | N/A |
| Majority | Majority | Majority | 58,285 | 20.86% | 4.12% |
| Turnout | Turnout | Turnout | 279,412 | 54.2% | |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

## Tennessee

Two-term incumbent Republican Lamar Alexander had been re-elected with 65% of the vote in 2008. Alexander sought re-election to a third term. On August 7, 2014, Alexander won the Republican nomination over six challengers, including State Representative Joe Carr.
On November 4, 2014, Alexander faced Democratic nominee Gordon Ball, Libertarian Party nominee Joshua James, Constitution Party nominee Joe Wilmothm, and independent Danny Page also ran in the general election.
Tennessee Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Lamar Alexander (incumbent) | 331,705 | 49.65% |
| | Republican | Joe Carr | 271,324 | 40.61% |
| | Republican | George Shea Flinn | 34,668 | 5.19% |
| | Republican | Christian Agnew | 11,320 | 1.69% |
| | Republican | Brenda S. Lenard | 7,908 | 1.18% |
| | Republican | John D. King | 7,748 | 1.16% |
| | Republican | Erin Kent Magee | 3,366 | 0.52% |
| Total votes | Total votes | Total votes | 668,039 | 100.00% |
Tennessee Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Gordon Ball | 87,829 | 36.45% |
| | Democratic | Terry Adams | 85,794 | 35.61% |
| | Democratic | Gary Gene Davis | 42,549 | 17.66% |
| | Democratic | Larry Crim | 24,777 | 10.28% |
| Total votes | Total votes | Total votes | 240,949 | 100.00% |
Tennessee general election :
| Party | Party | Candidate | Votes | % |
| | Republican | Lamar Alexander (incumbent) | 849,629 | 61.89% |
| | Democratic | Gordon Ball | 437,251 | 31.85% |
| | Constitution | Joe Wilmoth | 36,063 | 2.63% |
| | Green | Martin Pleasant | 12,536 | 0.91% |
| | Independent | Tom Emerson, Jr. | 11,149 | 0.81% |
| | Independent | Danny Page | 7,710 | 0.56% |
| | Independent | Rick Tyler | 5,753 | 0.42% |
| | Independent | Joshua James | 5,672 | 0.41% |
| | Independent | Bartholomew J. Phillips | 2,380 | 0.17% |
| | Independent | Edmund L. Gauthier | 2,311 | 0.17% |
| | Independent | Eric Schechter | 1,668 | 0.12% |
| | Independent | Choudhury Salekin | 784 | 0.06% |
| Total votes | Total votes | Total votes | 1,372,906 | 100.00% |

## Texas

Two-term incumbent Republican John Cornyn, the Senate Minority Whip, had been re-elected with 55% of the vote in 2008. Cornyn sought re-election, and won the 2014 Republican primary with 59% of the vote. David Alameel, a dentist, and Kesha Rogers, a volunteer for The Lyndon LaRouche Policy Institute, faced each other in a run-off election for the Democratic nomination. Alameel won the run-off and was the Democratic nominee.

## Virginia

One-term incumbent Democrat Mark Warner had been elected with 65% of the vote in 2008; he sought re-election. Ed Gillespie, former RNC Chairman and presidential adviser, ran for the Republican nomination. Robert Sarvis, the Libertarian nominee for Governor in 2013, also ran.
Virginia general election :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | Mark R. Warner (Incumbent) | 1,073,667 | 49.14% | −15.89% |
| | Republican | Edward W. Gillespie | 1,055,940 | 48.33% | +14.61% |
| | Libertarian | Robert Sarvis | 53,102 | 2.43% | +1.87% |
| | Write-ins | | 1,764 | 0.08% | −0.01% |
| Plurality | Plurality | Plurality | 17,727 | 0.81% | -30.49% |
| Turnout | Turnout | Turnout | 2,184,473 | | |
| | Democratic hold | Democratic hold | Swing | | |

## West Virginia

Five-term incumbent Democrat Jay Rockefeller had been re-elected with 64% of the vote in 2008. He announced on January 11, 2013, that he would not seek re-election to a sixth term. Secretary of State Natalie Tennant won the Democratic nomination.
On November 26, 2012, Republican Congresswoman Shelley Moore Capito announced her plans to run for the seat, in hopes of becoming the first Republican senator elected from West Virginia since 1956. Moore Capito won the Republican nomination and the general election, the first woman to serve as United States Senator from West Virginia.
West Virginia Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Natalie Tennant | 104,598 | 77.95% |
| | Democratic | Dennis Melton | 15,817 | 11.79% |
| | Democratic | David Wamsley | 13,773 | 10.26% |
| Total votes | Total votes | Total votes | 134,188 | 100.00% |
West Virginia Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Shelley Moore Capito | 74,655 | 87.50% |
| | Republican | Matthew Dodrill | 7,072 | 8.29% |
| | Republican | Larry Butcher | 3,595 | 4.21% |
| Total votes | Total votes | Total votes | 85,322 | 100.00% |
West Virginia general election :
| Party | Party | Candidate | Votes | % |
| | Republican | Shelley Moore Capito | 281,820 | 62.12% |
| | Democratic | Natalie Tennant | 156,360 | 34.47% |
| | Libertarian | John Buckley | 7,409 | 1.63% |
| | Mountain | Bob Henry Baber | 5,504 | 1.21% |
| | Constitution | Phil Hudok | 2,566 | 0.57% |
| Total votes | Total votes | Total votes | 453,658 | 100.00% |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

## Wyoming

Three-term incumbent Republican Mike Enzi had been re-elected with 76% of the vote in 2008. Enzi sought re-election. Liz Cheney, daughter of former Vice President Dick Cheney, briefly entered the race for the Republican nomination, but dropped her bid in January 2014. On August 19, Enzi won the Republican primary election with 82% of the vote, and Democrat Charlie Hardy, a former Catholic priest, won his party's primary election with 48% of the vote.
Wyoming Republican primary election :
| Party | Party | Candidate | Votes | % |
| | Republican | Mike Enzi (incumbent) | 77,965 | 78.51% |
| | Republican | Bryan E. Miller | 9,330 | 9.39% |
| | Republican | James "Coaltrain" Gregory | 3,740 | 3.77% |
| | Republican | Thomas Bleming | 2,504 | 2.52% |
| | Republican | Arthur Bruce Clifton | 1,403 | 1.41% |
| | Republican | Write-in | 346 | 0.35% |
| | Republican | Over Votes | 51 | 0.05% |
| | Republican | Under Votes | 3,973 | 4.00% |
| Total votes | Total votes | Total votes | 99,312 | 100.00% |
Wyoming Democratic primary election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Charlie Hardy | 7,200 | 39.33% |
| | Democratic | Rex Wilde | 3,012 | 16.46% |
| | Democratic | Al Hamburg | 2,988 | 16.32% |
| | Democratic | William Bryk | 1,670 | 9.12% |
| | Democratic | Write-in | 216 | 1.18% |
| | Democratic | Over Votes | 31 | 0.17% |
| | Democratic | Under Votes | 3,189 | 17.42% |
| Total votes | Total votes | Total votes | 18,306 | 100.00% |
Wyoming general election :
| Party | Party | Candidate | Votes | % |
| | Republican | Mike Enzi (incumbent) | 121,554 | 72.19% |
| | Democratic | Charlie Hardy | 29,377 | 17.45% |
| | Independent | Curt Gottshall | 13,311 | 7.90% |
| | Libertarian | Joseph Porambo | 3,677 | 2.18% |
| | Write-in | Other | 471 | 0.28% |
| Total votes | Total votes | Total votes | 168,390 | 100.00% |