Vice President Joe Biden walks toward his vehicle on the tarmac upon 

Vice President Joe Biden walks toward his vehicle on the tarmac upon his arrival on Air Force Two at Lexington Blue Grass Airport, Thursday, Oct. 11, 2012, in Lexington, Ky., for the vice presidential debate.  (AP Photo/Pablo Martinez Monsivais)
Associated Press
Vice President Joe Biden walks toward his vehicle on the tarmac upon his arrival on Air Force Two at Lexington Blue Grass Airport, Thursday, Oct. 11, 2012, in Lexington, Ky., for the vice presidential debate. (AP Photo/Pablo Martinez Monsivais)
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