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Vice President Joe Biden, left, speaks to Charlotte Mayor Anthony Foxx at the Democratic National Convention in Charlotte, N.C., on Tuesday, Sept. 4, 2012. (AP Photo/Charlie Neibergall)

Vice President Joe Biden, left, speaks to Charlotte Mayor Anthony Foxx at the Democratic National Convention in Charlotte, N.C., on Tuesday, Sept. 4, 2012. (AP Photo/Charlie Neibergall)