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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Republican vice presidential candidate Paul Ryan speaks during a campaign event at the Douglas County Fairgrounds, Castle Rock Colorado, November 4, 2012.
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President Barack Obama speaks at a campaign rally at the Community College of Aurora, in Aurora, Colorado, November 4, 2012.
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A supporter listens to President Obama at a campaign event at Austin Straubel International Airport in Green Bay, Wisconsin, November 1, 2012.
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Wearing a mask on Halloween, Carol Heye of Riverview, Florida, shows her support for Mitt Romney as he campaigns in Tampa, Florida, October 31, 2012.