Accompanied by U.S. Secret Service agents, Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters as he campaigns at Integrity Windows in Roanoke, Va., Thursday, Nov. 1, 2012. (AP Photo/Charles Dharapak)

Associated Press
Accompanied by U.S. Secret Service agents, Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters as he campaigns at Integrity Windows in Roanoke, Va., Thursday, Nov. 1, 2012. (AP Photo/Charles Dharapak)
Accompanied by U.S. Secret Service agents, Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters as he campaigns at Integrity Windows in Roanoke, Va., Thursday, Nov. 1, 2012. (AP Photo/Charles Dharapak)
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