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Vice President Joe Biden speaks to a crowd at the Durham Armory on Monday, Aug. 13, 2012 in Durham, N.C. (AP Photo/The Herald-Sun, Melissa Melvin-Rodriguez)

Vice President Joe Biden speaks to a crowd at the Durham Armory on Monday, Aug. 13, 2012 in Durham, N.C. (AP Photo/The Herald-Sun, Melissa Melvin-Rodriguez)

Vice President Joe Biden

Vice President Joe Biden on the 2012 campaign trail.