Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks to reporters on his campaign plane en route to Denver, Sunday, Sept. 23, 2012, as Sen. Rob Portman, R-Ohio, listens at right. (AP Photo/Charles Dharapak)

Associated Press
Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks to reporters on his campaign plane en route to Denver, Sunday, Sept. 23, 2012, as Sen. Rob Portman, R-Ohio, listens at right. (AP Photo/Charles Dharapak)
Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks to reporters on his campaign plane en route to Denver, Sunday, Sept. 23, 2012, as Sen. Rob Portman, R-Ohio, listens at right. (AP Photo/Charles Dharapak)
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