U.S. Secret Service agents stand back to back as Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns with vice presidential candidate Paul Ryan in Fishersville, Va., Thursday, Oct. 4, 2012. (AP Photo/Charles Dharapak)

Associated Press
U.S. Secret Service agents stand back to back as Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns with vice presidential candidate Paul Ryan in Fishersville, Va., Thursday, Oct. 4, 2012. (AP Photo/Charles Dharapak)
U.S. Secret Service agents stand back to back as Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns with vice presidential candidate Paul Ryan in Fishersville, Va., Thursday, Oct. 4, 2012. (AP Photo/Charles Dharapak)
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