For related races, see 2010 United States elections.
2010 United States Senate elections
← 2008
November 2, 2010[a]
2012 →
37 of the 100 seats in the United States Senate 51 seats needed for a majority
Majority party
Minority party
Leader
Harry Reid
Mitch McConnell
Party
Democratic
Republican
Leader's seat
Nevada
Kentucky
Seats before
57
41
Seats after
51
47
Seat change
6
6
Popular vote
32,405,787[1]
34,616,463
Percentage
45.1%
48.2%
Seats up
19
18
Races won
13
24
Third party
Party
Independent
Seats before
2[b]
Seats after
2[c]
Seat change
Popular vote
155,846
Percentage
0.2%
Seats up
0
Races won
0
Results of the elections: (excl. Massachusetts) Democratic hold Republican hold Republican gain No electionRectangular inset (N.Y.): both seats up for election
Majority Leader before election
Harry Reid
Democratic
Elected Majority Leader
Harry Reid
Democratic
The 2010 United States Senate elections were held on November 2, 2010, from among the United States Senate's 100 seats. A special election was held on January 19, 2010, for a mid-term vacancy in Massachusetts. Thirty-four of the November elections were for six-year terms to the Senate's Class 3, while other three were special elections to finish incomplete terms. Those 37 November elections featured 19 incumbent Democrats (seven of whom retired or were defeated in the primary) and 18 incumbent Republicans (eight of whom retired or were defeated in the primary).
After the 2008 elections, the Senate was composed of 58 Democrats, 40 Republicans, and 2 independents who caucused with the Democrats. However, in a January 2010 special election, Republicans picked up a seat in Massachusetts thereby reducing Democrats' majority to 57 seats.
Republicans won four seats held by retiring Democrats and also defeated two incumbent Democrats, for a Republican net gain of six seats. This was the first time since 1994 that Republicans successfully defended all of their own seats. This was also the fourth consecutive election of Class 3 senators where Democrats failed to gain seats. Despite the Republican gains, the Democrats retained a majority of the Senate with 51 seats plus the two independents who caucused with them, compared to the 47 Republican seats. As of 2023[update], this was the last time Republicans won U.S. Senate seats in Illinois and New Hampshire.
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