Visitors take photos of the main stage during the public unveiling of Democratic National Convention's facilities at Time Warner Arena in Charlotte, N.C., Friday, Aug. 31, 2012. (AP Photo/Chuck Burton)

Photo by: Chuck Burton

Visitors take photos of the main stage during the public unveiling of Democratic National Convention's facilities at Time Warner Arena in Charlotte, N.C., Friday, Aug. 31, 2012. (AP Photo/Chuck Burton)