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A Secret Service agent stands outside the bus of Republican presidential candidate, former Massachusetts Gov. Mitt Romney during a stop at Wawa gas station in in Quakertown, Pa. Saturday, June 16, 2012. (AP Photo/Evan Vucci)

Associated Press
A Secret Service agent stands outside the bus of Republican presidential candidate, former Massachusetts Gov. Mitt Romney during a stop at Wawa gas station in  in Quakertown, Pa. Saturday, June 16, 2012.  (AP Photo/Evan Vucci)
A Secret Service agent stands outside the bus of Republican presidential candidate, former Massachusetts Gov. Mitt Romney during a stop at Wawa gas station in in Quakertown, Pa. Saturday, June 16, 2012. (AP Photo/Evan Vucci)
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