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The 2010 United States elections were held on Tuesday, November 2, 2010, in the middle of Democratic President Barack Obama's first term. Republicans ended unified Democratic control of Congress and the presidency by winning a majority in the House of Representatives.

Republicans gained seven seats in the Senate (including a special election held in January 2010) but failed to gain a majority in the chamber. In the House of Representatives, Republicans won a net gain of 63 seats, the largest shift in seats since the 1948 elections. In state elections, Republicans won a net gain of six gubernatorial seats and flipped control of twenty state legislative chambers, giving them a substantial advantage in the redistricting that occurred following the 2010 United States Census.

Bold indicates a change in control. Note that not all states held gubernatorial, state legislative, and United States Senate elections in 2010.

State[16] Before 2010 elections[17] After 2010 elections[18]
State PVI Governor State leg. US Senate US House Governor State leg. US Senate US House
Alabama R+13
State[16] Before 2010 elections[17] After 2010 elections[18]
State P