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CHARLOTTE, NC - SEPTEMBER 06:  Campaign Manager, Obama for America Jim Messina speaks on stage during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate.  (Photo by Alex Wong/Getty Images),President Barack Obama's  campaign manager Jim Messina tours the floor at the Democratic National Convention in Charlotte, N.C., on Monday, Sept. 3, 2012. (AP Photo/Charles Dharapak) Charles Dharapak/AP