Republican presidential candidate, former Massachusetts Gov. Mitt Romney, accompanied by Sen. Rob Portman, R-Ohio, shakes hands with a worker as he makes an unscheduled stop at a Chipotle restaurant in Denver, Tuesday, Oct. 2, 2012. (AP Photo/Charles Dharapak)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, accompanied by Sen. Rob Portman, R-Ohio, shakes hands with a worker as he makes an unscheduled stop at a Chipotle restaurant in Denver, Tuesday, Oct. 2, 2012. (AP Photo/Charles Dharapak)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, accompanied by Sen. Rob Portman, R-Ohio, shakes hands with a worker as he makes an unscheduled stop at a Chipotle restaurant in Denver, Tuesday, Oct. 2, 2012. (AP Photo/Charles Dharapak)
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