Republican presidential candidate, former Massachusetts Gov. Mitt Romney poses for a photo with workers 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 poses for a photo with workers as he makes an unscheduled stop at a Chipotle restaurant in Denver, Tuesday, Oct. 2, 2012. (AP Photo/Charles Dharapak)
Mitt Romney poses for a photo with workers as he makes an unscheduled stop at a Chipotle restaurant in Denver, Tuesday, Oct. 2, 2012. The wide-eyed employee, Marty Arps, said his facial expression is just something he does when he's excited. (AP Photo/Charles Dharapak)
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