Harry Reid Democratic Mitch McConnell Republican The 2014 United States Senate elections were held on November 4, 2014.

Republicans also picked up another 4 open seats in Iowa, Montana, South Dakota, and West Virginia that were previously held by Democrats.

[10] Poll aggregation website FiveThirtyEight gave the Republican Party a 60% chance of taking control of the Senate as of September 28.

[13] 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.

[15][16] 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.

The party held all three competitive Republican-held seats (Kentucky, Kansas, and Georgia), and defeated incumbent Democrats in North Carolina, Colorado, and Arkansas.

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.

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.

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.

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.

Republican lieutenant governor Mead Treadwell,[54] 2010 nominee Joe Miller,[55] State Natural Resources Commissioner Daniel S. Sullivan,[56] and Air Force veteran John Jaramillo ran for the GOP nomination.

[75][76] Other declared Democratic candidates included former state senator Steen Miles, psychiatrist Branko Radulovacki, and former US Army Ranger Todd Robinson.

[83] 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.

[100] Doug Butzier, who was the Libertarian Party's nominee, died in a plane crash on October 13, 2014, but still appeared on the ballot.

[109] On September 3, Taylor announced he was dropping out of the election, leading to speculation that Democrats would support Orman's candidacy.

[115][116] Actress Ashley Judd publicly claimed to be considering a run for the Democratic nomination, but ultimately decided against it.

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.

[129][130] Shenna Bellows, former executive director of the American Civil Liberties Union of Maine, was the Democratic nominee.

[135] Democratic Congressman Ed Markey beat Republican Gabriel E. Gomez in the June 25, 2013 special election by a 55% to 45% margin.

[144] State Representative Jim Abeler,[145] St. Louis County Commissioner Chris Dahlberg,[146] co-CEO of Lazard Middle Market Mike McFadden, bison farmer and former hair salon owner Monti Moreno,[147] state Senator Julianne Ortman,[148] and U.S. Navy reservist Phillip Parrish[149] ran for the Republican nomination.

[154][155] Tea Party candidate Chris McDaniel, a conservative Mississippi state senator, ran against Cochran in the Republican primary.

[168] The Montana Democratic Party held a special nominating convention on August 16 to choose a replacement for Walsh.

[169] Congressman Steve Daines won the Republican nomination[170] over state Representative Champ Edmunds of Missoula and David Leaser of Kalispell.

[175] Former state Treasurer Shane Osborn,[176] attorney Bart McLeay, banker Sid Dinsdale, and Midland University President Ben Sasse ran for the Republican nomination.

After announcing he would not seek re-election, Lautenberg died in June 2013, aged 89, after a long period of ill health.

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,[210] with Wehby ultimately winning the nomination in the May 20 primary.

[234] On August 7, 2014, Alexander won the Republican nomination over six challengers, including State Representative Joe Carr.

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.

[243] Moore Capito won the Republican nomination and the general election, the first woman to serve as United States Senator from West Virginia.