FILE - In this Oct. 15, 2008 file photo, then-Democratic presidential candidate Sen. Barack Obama, D-Ill., left, and Republican presidential candidate Sen. John McCain, R-Ariz., right,

 

              FILE - In this Oct. 15, 2008 file photo, then-Democratic presidential candidate Sen. Barack Obama, D-Ill., left, and Republican presidential candidate Sen. John McCain, R-Ariz., right,
FILE - In this Oct. 15, 2008 file photo, then-Democratic presidential candidate Sen. Barack Obama, D-Ill., left, and Republican presidential candidate Sen. John McCain, R-Ariz., 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 Barack Obama goes one-on-one with Republican Mitt Romney in three prime-time debates. With the race a dead heat, the debates take on an oversized role in the few weeks between now and Election Day. One small mistake or impression _ a glance at a watch, repetitive sighing _ could roil the campaign for days and linger in voters’ mind. This is especially true for two polished candidates who will have the soundbites and rhetoric down cool. (AP Photo/Ron Edmonds, File)