Rep. Todd Akin, R-Mo., says Rep. Paul Ryan, R-Wis., the GOP vice presidential candidate, asked him to end his Senate bid after recent comments he made referring to "legitimate rape." Jeff Roberson/AP hide caption

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Artur Davis, with his wife, Tara, concedes the Democratic gubernatorial race in Birmingham, Ala., in 2010. Since losing that race, he has become a Republican and moved to Virginia. Mark Almond/AP hide caption

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Rep. Paul Ryan, R-Wis., at a campaign event on June 18 in Janesville, Wis. Ryan, Mitt Romney's running mate, has made sure his constituents haven't been left out of federal programs like the stimulus. Evan Vucci/AP hide caption

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Businessman John Brunner is making his first run for elective office in the Missouri Senate race. Brian Naylor/NPR hide caption

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Former Minnesota Gov. Tim Pawlenty and GOP presidential candidate Mitt Romney campaign in Las Vegas on Oct. 17, 2011. Ethan Miller/Getty Images hide caption

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Mitt Romney appears on ABC News in one of the five TV interviews he did Friday. He mostly responded to comments from the Obama campaign about his role at Bain Capital. ABC News hide caption

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Will these Green Bay fans be cheering as much as they did during the 2011 Super Bowl when their beloved Packer games are interrupted by local political ads this fall? Matt Ludtke/Getty Images hide caption

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President Obama at a stop on his bus tour of Ohio in Port Clinton on July 5. Jim Watson/AFP/Getty Images hide caption

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Bank of America stadium in Charlotte, N.C., where President Obama will accept his party's nomination on Sept. 6. Jeff Siner/MCT/Landov hide caption

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Daniella Urbina, a field organizer for President Obama in Denver, appears in a Spanish-language campaign ad. YouTube hide caption

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Democrat Ron Barber (left) and Republican Jesse Kelly during a May 23 debate in Tucson. They are running Tuesday in a special election to replace retired Rep. Gabrielle Giffords. Kelly Presnell/Arizona Daily Star hide caption

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Democratic Senate candidate Heidi Heitkamp greets a supporter before a town hall meeting in Minot, N.D., on May 3. Dale Wetzel/AP hide caption

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An air traffic controller works at the Atlanta TRACON, or terminal radar approach control, facility in Peachtree City, Ga. The FAA's NextGen program will modernize the air traffic control system, transforming it from radar to GPS-based technology. David Goldman/AP hide caption

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Joe Ricketts, whose American Film Company produced The Conspirator, arrives at the film's premiere during the Toronto International Film Festival in 2010. Alberto E. Rodriguez/Getty Images hide caption

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Nebraska state Sen. Deb Fischer applauds supporters at her election party Tuesday in Lincoln, Neb. At right is Fischer's mother, Florence Strobel. Nati Harnik/AP hide caption

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