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Republican presidential candidate, former Massachusetts Gov. Mitt Romney steps on stage to speak at a campaign event at the Iowa Events Center Sunday, Nov. 4, 2012, in Des Moines, Iowa. (AP Photo/David Goldman)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney steps on stage to speak at a campaign event at the Iowa Events Center Sunday, Nov. 4, 2012, in Des Moines, Iowa. (AP Photo/David Goldman)

Mitt Romney

Yahoo News

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