2018 United States Senate elections

2018 United States Senate elections

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33 of the 100 seats (Class 1) in the United States Senate
(and 2 special elections)
51 seats needed for a majority
 Majority partyMinority party
 Mitch McConnell 2016 crop.jpgChuck Schumer official photo (cropped).jpg
LeaderMitch McConnellChuck Schumer
PartyRepublicanDemocratic
Leader sinceJanuary 3, 2007January 3, 2017
Leader's seatKentuckyNew York
Last election5246
Seats before5147
Seats after5345
Seat changeIncrease 2Decrease 2
Popular vote34,948,225[1]53,044,160[2][a]
Percentage39.1%59.3%[a]
SwingDecrease 3.3%Increase 5.5%
Seats up924
Races won1122

 Third party
 
PartyIndependent
Seats before2
Seats after2
Seat changeSteady
Popular vote765,817
Percentage0.9%
SwingIncrease 0.4%
Seats up2
Races won2

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Results of the general and special elections
     Democratic hold      Democratic gain
     Republican hold      Republican gain
     Independent hold
     No election
Line through state means both seats are up for election.

Majority Leader before election

Mitch McConnell
Republican

Elected Majority Leader

Mitch McConnell
Republican

Elections to the United States Senate were held on November 6, 2018. Thirty-three of the 100 seats were contested in regular elections, while two others were contested in special elections due to Senate vacancies in Minnesota and Mississippi. The winners were elected to six-year terms running from January 3, 2019, to January 3, 2025. Senate Democrats had 26 seats up for election (including the seats of two independents who caucus with them), while Senate Republicans had nine seats up for election.

To maintain their working majority of 50 Senators and Republican Vice President Mike Pence (who is able to cast a tie-breaking vote in accordance with Article One of the United States Constitution), Republicans could only afford a net loss of one Senate seat in the 2018 elections. Three Republican-held seats were open as a result of retirements in Tennessee, Utah, and Arizona. Democrats faced what was considered an extremely unfavorable map, as they were defending ten seats in states won by Donald Trump in the 2016 presidential election (and 26 in total), while Republicans were only defending one seat in a state won by Hillary Clinton in 2016 (and nine in total).

The Republicans maintained a Senate majority following the 2018 elections, defeating Democratic incumbents in four states (Florida, Indiana, Missouri, and North Dakota). Democrats defeated a Republican incumbent in Nevada and gained an open seat in Arizona that was previously held by a Republican.