CHARLOTTE, NC – SEPTEMBER 05: U.S. President Bill Clinton greets Democratic presidential candidate, U.S. President Barack Obama (L) on stage during day two of the Democratic National Convention at Time Warner Cable Arena on September 5, 2012 in Charlotte, North Carolina. The DNC that will run through September 7, will nominate U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Chip Somodevilla/Getty Images)