Former Massachusetts Gov. Mitt Romney, left, chats with former Vice President Al Gore, lower right, as they stand along with former Tennessee Sen. Fred Thompson, top, and Tipper Gore before the start of a townhall-style presidential debate between Democratic presidential candidate Sen. Barack Obama, D-Ill., and Republican presidential candidate Sen. John McCain, R-Ariz., at Belmont University in Nashville, Tenn., Tuesday, Oct. 7, 2008. (AP Photo/J. Scott Applewhite)

Former Massachusetts Gov. Mitt Romney speaks at the Republican National Convention in St. Paul, Minn., Wednesday, Sept. 3, 2008. (AP Photo/Susan Walsh)

Former Massachusetts Gov. Mitt Romney speaks at the Republican National Convention in St. Paul, Minn., Wednesday, Sept. 3, 2008. (AP Photo/Susan Walsh)

Former Massachusetts Gov. Mitt Romney speaks at the Republican National Convention in St. Paul, Minn., Wednesday, Sept. 3, 2008. (AP Photo/Susan Walsh)

Former Massachusetts Gov. Mitt Romney, accompanied by his family, addresses a meeting of Republican delegates in St. Paul, Minn., Wednesday morning Sept. 3, 2008. From left behind Romney are his sons, Matt and Josh, and wife, Ann. (AP Photo/Janet Hostetter)

Former Massachusetts Gov. Mitt Romney, accompanied by his family, addresses a meeting of Republican delegates in St. Paul, Minn., Wednesday morning Sept. 3, 2008. From left behind Romney are his sons, Matt and Josh, and wife, Ann. (AP Photo/Janet Hostetter)

Former Massachusetts Gov. and presidential candidate Mitt Romney, left, listens as stage manager Howard Kolins explains the podium arrangement in preparation for his appearance at the Republican National Convention in St. Paul, Minn., later on Tuesday, Sept. 2, 2008. (AP Photo/Ron Edmonds)

Former Massachusetts Gov. and presidential candidate Mitt Romney, left, listens as stage manager Howard Kolins explains the podium arrangement in preparation for his appearance at the Republican National Convention in St. Paul, Minn., later on Tuesday, Sept. 2, 2008. (AP Photo/Ron Edmonds)

Former Massachusetts Gov. and presidential candidate Mitt Romney, left, listens as stage manager Howard Kolins explains the podium arrangement in preparation for his appearance at the Republican National Convention in St. Paul, Minn., later on Tuesday, Sept. 2, 2008. (AP Photo/Ron Edmonds)

Former Massachusetts Gov. Mitt Romney, center in light shirt, bows his head in prayer during a chapel service at the Salvation Army Harbor Lights, Tuesday, Sept. 2, 2008 in Minneapolis. After the service, Romney helped serve breakfast to the residents, which included the people in the red shirts. Man next to him is David Frauenshuh, a Salvation Army supporter. (AP Photo/Jim Mone)