In this Dec. 2, 1997 file photo, then-Senate Governmental Affairs Committee Chairman Sen. Fred Thompson, R-Tenn., meets reporters on Capitol Hill in Washington. (AP Photo/Joe Marquette, File)

Then-Republican presidential hopeful, former Tennessee Sen. Fred Thompson fields questions from the media during a campaign stop to talk to supporters in Prosperity, S.C. in this Jan. 17, 2008 file photo. Thompson has quit the presidential race, according to a statement. (AP Photo/Mary Ann Chastain, File)

Then-Republican presidential hopeful, former Tennessee Sen. Fred Thompson speaks to supporters in Seneca, S.C. in this Jan. 18, 2008 file photo. Thompson has quit the presidential race, according to a statement. (AP Photo/Patrick Collard, File)

Republican presidential hopeful, former Sen. Fred Thompson, R-Tenn., addresses supporters during a post-primary campaign rally on the campus of The University of South Carolina Saturday, Jan. 19, 2008, in Columbia, S.C.(AP Photo/Mary Ann Chastain)

Republican presidential hopeful, former Sen. Fred Thompson, R-Tenn., addresses supporters during a post-primary campaign rally on the campus of The University of South Carolina Saturday, Jan. 19, 2008, in Columbia, S.C.(AP Photo/Mary Ann Chastain)

Republican presidential hopeful, former Sen. Fred Thompson, R-Tenn., addresses supporters during a post-primary campaign rally on the campus of The University of South Carolina Saturday, Jan. 19, 2008, in Columbia, S.C.(AP Photo/Mary Ann Chastain)

Republican presidential hopeful former Sen. Fred Thompson, R-Tenn., arrives in the rain with his wife Jeri for a campaign stop at the Lizard's Thicket Saturday, Jan. 19, 2008, in Columbia, S.C.(AP Photo/Mary Ann Chastain)

Republican presidential hopeful, former Sen. Fred Thompson, R-Tenn., speaks to supporters during a campaign stop in Greenville, S.C., Friday, Jan. 18, 2008. (AP Photo/Patrick Collard)

Jeri Thompson holds her son Sammy, 1, as her husband Republican presidential hopeful former Sen. Fred Thompson, R-Tenn. makes a campaign stop to take part in a talk radio show Thursday, Jan. 17, 2008, in West Columbia, S.C. (AP Photo/Mary Ann Chastain)

Republican presidential hopeful, former Sen. Fred Thompson, R-Tenn., fields questions from the media during a campaign stop to talk to supporters Thursday, Jan. 17, 2008, in Prosperity, S.C. (AP Photo/Mary Ann Chastain)