Kimberly Fisher cast her ballot Wednesday at a polling place at the Wicomico County Youth and Civic Center in Salisbury, Md. Alex Brandon/AP hide caption

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A boy examines CSPAN's 2012 presidential race electoral map at the American Presidential Experience exhibit last month in Charlotte, N.C. Brendan Smialowski/AFP/Getty Images hide caption

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It's true that Mitt Romney trails President Obama in most key battleground states, but the margins are in single digits Mark Lennihan/AP hide caption

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For Romney to win the election, he is going to have to pick off some big states from Obama's 2008 tally. AP hide caption

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