Mitt Romney

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Former President Bill Clinton (right) introduces Republican presidential candidate Mitt Romney at the Clinton Global Initiative meeting in New York on Tuesday, Sept. 25, 2012. (AP Photo/Evan Vucci)

Former President Bill Clinton reaches out for Republican presidential candidate Mitt Romney as he grabs his notes after speaking at the Clinton Global Initiative convention in New York on Sept. 25, 2012. (Associated Press)

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Republican presidential candidate Mitt Romney speaks at the Pueblo Weisbrod Aircraft Museum in Pueblo, Colo., on Monday, Sept. 24, 2012, during a campaign stop. (AP Photo/Bryan Oller)

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Republican presidential candidate Mitt Romney embraces a supporter at a campaign event in Pueblo, Colo., on Monday. Colorado is a swing state. (Associated Press)

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Republican presidential candidate Mitt Romney campaigns Sept. 24, 2012, in Pueblo, Colo. (Associated Press)

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**FILE** Republican presidential candidate Mitt Romney campaigns Sept. 14, 2012, in the rain at Lake Erie College in Painesville, Ohio. (Associated Press)

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Republican presidential candidate Mitt Romney campaigns at D’Evelyn High School in Denver on Sunday, Sept. 23, 2012. (AP Photo/Charles Dharapak)

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** FILE ** In these Aug. 2012 photos, President Obama and Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, campaign. The challenge for Obama and Romney is how to lay claim to the small but mightily important swath of the electorate, the undecided likely voter. (AP Photos)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney gets ready to board his campaign plane in Los Angeles, Sunday, Sept. 23, 2012. (AP Photo/Charles Dharapak)