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Republican presidential candidate and former Massachusetts Gov. Mitt Romney is accompanied by a U.S. Secret Service agent as he leaves debate preparation at a hotel in Columbus, Ohio, Saturday, Oct. 13, 2012. (AP Photo/Charles Dharapak)

Associated Press
Republican presidential candidate and former Massachusetts Gov. Mitt Romney is accompanied by a U.S. Secret Service agent as he leaves debate preparation at a hotel in Columbus, Ohio, Saturday, Oct. 13, 2012. (AP Photo/Charles Dharapak)
Republican presidential candidate and former Massachusetts Gov. Mitt Romney is accompanied by a U.S. Secret Service agent as he leaves debate preparation at a hotel in Columbus, Ohio, Saturday, Oct. 13, 2012. (AP Photo/Charles Dharapak)
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