** ADVANCE FOR WEEKEND OF AUG. 23-24 AND THEREAFTER - FILE ** In this May 6, 2008 file photo Democratic presidential hopeful Sen. Barack Obama, D-Ill., smiles while speaking at a primary election night rally in Raleigh, N.C., after sweeping to victory in the North Carolina presidential primary. On Aug. 28, Barack Obama will step on the stage at the 50-yard line at the Denver Broncos football stadium before a crowd of 75,000 to accept the Democratic nomination for president. He will be at the apex of American politics _ a phenomenon who smashed every fundraising record, drew astounding crowds, and made history, while leaving many to wonder how this man went so far so fast. (AP Photo/Jae C. Hong, File)