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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Rep. Paul Ryan, the GOP vice presidential nominee, became a speech writer for the conservative Republican politician Jack Kemp after graduating from college in 1992. J. Scott Applewhite/AP hide caption

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Mitt Romney, who this week is set to accept the Republican presidential nomination, with wife Ann on Sunday in Wolfeboro, N.H. Jewel Samad /AFP/Getty Images hide caption

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Gov. Rick Perry rules the roost at the Texas Republican Convention in Fort Worth on June 7. But his endorsement of Lt. Gov. David Dewhurst fell flat this week as Tea Party fave Ted Cruz crushed Dewhurst in a GOP runoff for U.S. Senate. LM Otero/AP hide caption

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President Obama leads Mitt Romney 47 percent to 45 percent among all voters in a new NPR poll. But the two are tied among voters from 12 battleground states. Carolyn Kaster/Evan Vucci/AP hide caption

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The U.S. Supreme Court on the eve of a hearing about the Florida presidential election recount, Nov. 30, 2000. The justices later ruled 5-4 in the case of Bush v. Gore, effectively deciding the outcome of the presidential race. Alex Wong/Getty Images hide caption

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Wisconsin Republican Gov. Scott Walker (right) celebrates his win over Democratic challenger Tom Barrett at Tuesday night's victory party in Waukesha, Wis. Morry Gash/AP hide caption

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Republican presidential candidate Mitt Romney walks past Donald Trump's airplane as he arrives in Las Vegas on Tuesday, where he met with Trump for a fundraiser. Mary Altaffer/AP hide caption

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Protesters march outside the Abraham Lincoln Presidential Hotel where Wisconsin Gov. Scott Walker is speaking to the Illinois Chamber of Commerce on April 17 in Springfield, Ill. Walker faces Democrat Tom Barrett in a recall election June 5. The events in the state over the next four weeks could be a sign of where the U.S. is headed in the months ahea Seth Perlman/AP hide caption

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Republican presidential candidate, former U.S. Sen. Rick Santorum speaks at a campaign rally at Four Seasons Sheraton in Mars, Pa., Monday night. Rival Mitt Romney won the Washington, D.C., Maryland and Wisconsin primaries. Jeff Swensen/Getty Images hide caption

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