FILE - In this Oct. 15, 2008 photo, then-Democratic presidential candidate Sen. Barack Obama of Illinois, left, and Republican presidential candidate Sen. John McCain of Arizona, right, exchange responses as debate moderator Bob Schieffer listens during a presidential debate at Hofstra University in Hempstead, N.Y. Finally, the fall season delivers the matchup Americans have been waiting for, President Obama goes one-on-one with Republican Mitt Romney in three prime-time debates. (AP Photo/Ron Edmonds, File)