Republican presidential candidate Sen. John McCain, R-Ariz., answers questions from John McCain Debate moderator Tom Brokaw as Democratic presidential candidate Sen. Barack Obama, D-Ill., listens during a townhall-style presidential debate at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/Ron Edmonds)

Republican presidential candidate Sen. John McCain, R-Ariz., speaks at a town hall-style presidential debate at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/Scott Olson, Pool)

Republican presidential candidate Sen. John McCain, R-Ariz., speaks at a town hall-style presidential debate at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/Scott Olson, Pool)

Republican presidential candidate Sen. John McCain, R-Ariz., speaks as Democratic presidential candidate Sen. Barack Obama, D-Ill., listens during a town hall-style presidential debate at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/Scott Olson, Pool)

Republican presidential candidate Sen. John McCain, R-Ariz., left, speaks as Democratic presidential candidate Sen. Barack Obama, D-Ill., listens during a townhall-style presidential debate at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/Mark Humphrey)

Republican presidential candidate Sen. John McCain, R-Ariz., speaks during a town hall-style presidential debate at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/Scott Olson, Pool)

Republican presidential candidate Sen. John McCain, R-Ariz., right, speaks as Democratic presidential candidate Sen. Barack Obama, D-Ill., listens during a townhall-style presidential debate at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/J. Scott Applewhite)

Republican presidential candidate Sen. John McCain, R-Ariz., answers a question at a townhall-style presidential debate at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/Ron Edmonds)

Republican presidential candidate Sen. John McCain, R-Ariz., speaks as Democratic presidential candidate Sen. Barack Obama, D-Ill., listens during a townhall-style presidential debate at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/Mark Humphrey)

Republican presidential candidate Sen. John McCain, R-Ariz., answers questions from John McCain Debate moderator Tom Brokaw as Democratic presidential candidate Sen. Barack Obama, D-Ill., listens during a townhall-style presidential debate at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/Ron Edmonds)