A bicyclist rides through the plaza on the east side of the U.S. Capitol in Washington, D.C. Chip Somodevilla/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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President Barack Obama joins Former President Bill Clinton on stage during the Democratic National Convention in Charlotte, N.C., on Wednesday. J. Scott Applewhite/AP hide caption

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V ice President Joe Biden, left, and President Obama embrace following Biden's vice-presidential nomination acceptance speech at the Democratic National Convention in Denver, Wednesday, Aug. 27, 2008. Paul Sancya/AP hide caption

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