Elections to the United States Senate will be held on November 2, 2010, for 36 of the 100 seats in the United States Senate. A 37th election will be held in Massachusetts on Jan 17, 2010.
Thirty-four of the seats are for six-year terms, beginning January 3, 2011. They will join Senate Class III, which traces its roots back to the Senators who served full six-year terms from March 4, 1789 to March 3, 1795.
The Senate is currently composed of 58 Democrats, 40 Republicans, and two independents who caucus with the Democrats. Of the seats expected to be up for election in 2010, 19 are held by Democrats and 18 are held by Republicans.
