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Republican presidential candidate Mitt Romney steps to the podium after an introduction by former President Bill Clinton, Tuesday, Sept. 25, 2012, at the Clinton Global Initiative in New York. (AP Photo/Mark Lennihan)

Republican presidential candidate Mitt Romney steps to the podium after an introduction by former President Bill Clinton, Tuesday, Sept. 25, 2012, at the Clinton Global Initiative in New York. (AP Photo/Mark Lennihan)

Mitt Romney

Yahoo News

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