Vice President Joe Biden gestures as he walks onto the field before 

Vice President Joe Biden gestures as he walks onto the field before giving the commencement address at the University of Pennsylvania's 257th Commencement, Monday, May 13, 2013, in Philadelphia. (AP Photo/Matt Rourke)
Associated Press
Vice President Joe Biden gestures as he walks onto the field before giving the commencement address at the University of Pennsylvania's 257th Commencement, Monday, May 13, 2013, in Philadelphia. (AP Photo/Matt Rourke)
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