Republican presidential candidate Mitt Romney visits a campaign call center in Green Tree, Pa., Tuesday, Nov. 6, 2012. (AP Photo/Charles Dharapak)

Associated Press
Republican presidential candidate Mitt Romney visits a campaign call center in Green Tree, Pa., Tuesday, Nov. 6, 2012. (AP Photo/Charles Dharapak)
Republican presidential candidate Mitt Romney visits a campaign call center in Green Tree, Pa., Tuesday, Nov. 6, 2012. (AP Photo/Charles Dharapak)
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