Mitt Romney

Associated Press
FILE - In this June 18, 2012, file photo RNC chairman Reince Priebus, right, Rep. Paul Ryan, R-Wis., Republican presidential candidate, former Massachusetts Gov. Mitt Romney, and Gov. Scott Walker, R-Wis., left, arrive at a campaign event in Janesville, Wis. Priebus said on a talk show Sunday Aug. 26, 2012, that Republican candidate Todd Akin's insistence on staying in the Missouri Senate race could cost the party its chance to win control of the Senate.  (AP Photo/Evan Vucci, File)

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Highlights from Republican presidential nominee Mitt Romney's 2012 campaign trail.

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