Vice President Joe Biden, accompanied by his wife Jill Biden, board Air Force Two, Tuesday, Nov. 6, 2012, at a Delaware Air National Guard Base in New Castle , Del., en route to Chicago. (AP Photo/Matt Rourke)

Associated Press
Vice President Joe Biden, accompanied by his wife Jill Biden, board Air Force Two, Tuesday, Nov. 6, 2012, at a Delaware Air National Guard Base in New Castle , Del., en route to Chicago.  (AP Photo/Matt Rourke)
Vice President Joe Biden, accompanied by his wife Jill Biden, board Air Force Two, Tuesday, Nov. 6, 2012, at a Delaware Air National Guard Base in New Castle , Del., en route to Chicago. (AP Photo/Matt Rourke)
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