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Republican vice presidential candidate, Rep. Paul Ryan, R-Wis. applauds at right as Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks during a campaign rally, Monday, Aug. 20, 2012, in Manchester N.H. (AP Photo/Evan Vucci)

Republican vice presidential candidate, Rep. Paul Ryan, R-Wis. applauds at right as Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks during a campaign rally, Monday, Aug. 20, 2012, in Manchester N.H. (AP Photo/Evan Vucci)

Mitt Romney

Yahoo News

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