Candidates Barack Obama and Mitt Romney remain tied in key battleground states a day before Election Day in the United States
US Presidential Race In Its Home Stretch
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Supporters listen to Republican Presidential candidate Mitt Romney during a rally at the Veterans Memorial Coliseum in Marion, Ohio, October 28, 2012.
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Vice President Joe Biden speaks at a campaign rally at the Municipal Auditorium in Sarasota, Florida, October 31, 2012.
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An Obama supporter casts his ballot early at an outdoor ballot box in Denver, Colorado October 30, 2012.