Nov. 4 pivotal vote, where all 435 seats in the House of Representatives and a third of the Senate's 100 seats are at stake, will determine whether Republicans or Democrats control Congress.
US Votes in Crucial Midterm Election
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Lauren Koepp and Kara Smyth pose for a photo after casting their votes early on Election Day in Austin, Texas, Nov. 4, 2014.
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A voter enters the voting booth at Bishop Leo E. O'Neil Youth Center in Manchester, New Hampshire, Nov. 4, 2014. New Hampshire features a tight race between incumbent U.S. Senator Jeanne Shaheen (D-NH) and former Massachusetts U.S. Senator Scott Brown.
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U.S. Senate Minority Leader Mitch McConnell waits to cast his vote after marking his ballot at Bellarmine University in Louisville, Kentucky, Nov. 4, 2014.
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Pedestrians pass by a D.C. Cannabis Campaign sign in Washington, D.C., Nov. 4, 2014. Voters in the U.S. capital and two West Coast states will decide whether to legalize marijuana in a test for broader cannabis legalization efforts across the United States.