President Barack Obama, left, greets patrons during an unscheduled stop at the Buff Restaurant, Sunday, Sept. 2, 2012, in Boulder, Colo. (AP Photo/Pablo Martinez Monsivais)

Associated Press
President Barack Obama, left, greets patrons during an unscheduled stop at the Buff Restaurant, Sunday, Sept. 2, 2012, in Boulder, Colo. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama, left, greets patrons during an unscheduled stop at the Buff Restaurant, Sunday, Sept. 2, 2012, in Boulder, Colo. (AP Photo/Pablo Martinez Monsivais)
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