Delegates filled the floor Tuesday during the Republican National Convention at the Tampa Bay Times Forum in Tampa, Fla. Win McNamee/Getty Images hide caption

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President Obama walks onto the stage before speaking at the University of North Carolina in Chapel Hill on April 24. Gerry Broome/AP hide caption

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Rep. Todd Akin, R-Mo., and his wife Lulli, talk with reporters last Thursday at the Missouri State Fair in Sedalia, Mo. On Monday, Akin was resisting GOP calls to resign from his Senate race. Orlin Wagner/AP hide caption

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Rep. Paul Ryan, who has been chosen by Mitt Romney to be his running mate on the GOP ticket, greeting supporters Sunday in his home state of Wisconsin. Ryan will be in Iowa today. Saul Loeb/AFP/Getty Images hide caption

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