This combination of file pictures shows (L) supporters cheering US President Barack Obama after he accepted the Democratic National Convention's nomination to run for a second term as president at the Time Warner Cable Arena in Charlotte, North Carolina, on September 6, 2012 on the final day of the DNC, and (R) Republican presidential candidate Mitt Romney and vice presidential nominee Paul Ryan welcoming their families onto the stage following Romney's acceptance speech at the Tampa Bay Times Forum in Tampa, Florida, on August 30, 2012 on the final day of the Republican National Convention (RNC). AFP PHOTO Stan HONDASTAN HONDA/AFP/GettyImages Photo: Stan Honda, AFP/Getty Images