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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Amelia Sinclair, 25, fills out her ballot at a polling place in a laundromat on Election Day in Long Beach, California, Nov. 4, 2014.
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Democratic New York Governor Andrew Cuomo and his girlfriend Sandra Lee greet supporters after casting their ballots at the Presbyterian Church in the town of Mount Kisco, New York, Nov. 4, 2014.
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Voters fill in their ballots at a polling place located in Shoaf's Wagon Wheel during the U.S. midterm elections in Salisbury, North Carolina, Nov. 4, 2014.
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Republican Senate candidate State Sen. Joni Ernst casts her ballot in the general election, Nov. 4, 2014, in Red Oak, Iowa.