Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns at McCandless Trucking in North Las Vegas, Nev., Friday, Aug. 3, 2012. (AP Photo/Charles Dharapak)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns at McCandless Trucking in North Las Vegas, Nev., Friday, Aug. 3, 2012. (AP Photo/Charles Dharapak)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns at McCandless Trucking in North Las Vegas, Nev., Friday, Aug. 3, 2012. (AP Photo/Charles Dharapak)
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