Politics

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Vice President Joseph R. Biden Jr. addresses a grassroots rally in Minneapolis on Aug. 21, 2012. (Associated Press)

** FILE ** In this Feb 18, 2012, file photo, Senate candidate Rep. Todd Akin, R-Missouri, waves to the crowd while introduced at a senate candidate forum during a Republican conference in Kansas City, Mo. (AP Photo/Orlin Wagner, File)

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From left, United States Coast Guard Seaman John Zegarra, Boatswain's Mate 2nd Class Tesse Wilson and Chief Petty Officer Shawn Hansen demonstrate an 18' Zodiac inflatable boat in downtown Tampa, Fla., on Tuesday, Aug. 7, 2012. The Hillsborough County Sheriff's Office, Tampa Police department, United States Coast Guard and the the Florida Fish and Wildlife Conservation Commission displayed vessels they will use to secure waterways during the Republican National Convention in Tampa in a special event open only to the media. (AP Photo/The Tampa Bay Times, Edmund D. Fountain)

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Heinz-Christian Strache, head of the Austrian right-wing Freedom Party, lifts a mug of beer during his traditional Ash Wednesday speech in Ried, Austria, on Wednesday, Feb. 22, 2012. (AP Photo/dapd, Rudolf Brandstaetter)

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Republican vice presidential candidate Paul Ryan speaks Aug. 21, 2012, during a campaign rally at Beaver Steel in Carnegie, Pa. (Associated Press)

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President Obama greets people at the Ohio State University Student Union on Tuesday, Aug. 21, 2012, in Columbus, Ohio. (AP Photo/Carolyn Kaster)

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President Obama exits Marine One on Aug. 21, 2012, at Andrews Air Force Base, Md., before boarding Air Force One for a flight to Columbus, Ohio. (Associated Press)

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Construction is under way on Monday, Aug. 20, 2012, along railroad lines linking tracks in Rason in far northeastern North Korea with Russian rail lines. (AP Photo/Kim Kwang Hyon)

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This photo combo shows (from left) entertainer Justin Bieber, an iPhone, and Secretary of State Hillary Rodham Clinton. This year's Beloit College Mindset List, a nonscientific compilation, is meant to remind teachers that college freshmen, born mostly in 1994, see the world in a much different way. (Associated Press)

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** FILE ** In this Aug. 9, 2012, file photo, army trucks carry Egyptian military tanks in El Arish, Egypt's northern Sinai Peninsula. Israeli officials said Tuesday, Aug. 21, 2012, they have voiced objections to what they say are improper Egyptian tank deployments in a volatile desert area near the Israeli border. (AP Photo, File)