Vice President Joe Biden speaks during the University of Pennsylvania's 257th Commencement, Monday, May 13, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Associated Press
Vice President Joe Biden speaks during the University of Pennsylvania's 257th Commencement, Monday, May 13, 2013, in Philadelphia. (AP Photo/Matt Rourke)
Vice President Joe Biden speaks during the University of Pennsylvania's 257th Commencement, Monday, May 13, 2013, in Philadelphia. (AP Photo/Matt Rourke)
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