United States Senate elections, 2010
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|United States Senate|
|Primary election dates, 2010|
Thirty-four of the seats are for six-year terms that begin on January 3, 2011.
The Senate is currently composed of 58 Democrats, 40 Republicans, and two independents. Of the seats up for election in 2010, 19 are held by Democrats and 18 are held by Republicans.