Sen. Thompson To Join Race

Former Tennessee Senator Fred Thompson is set to file the paper work for a "testing the waters" committee this coming Monday, the day before the CNN Republican debate.

"Thompson, as of now, is seen by some as best positioned to be the guy who can keep this conservative coalition together," says Chuck Todd of NBC.

Todd goes onto say: "Like the rest of the three frontrunners, though, there are some positions Thompson has taken in the past (including supporting McCain-Feingold campaign finance regulation and abortion) that indicate Thompson may be just as muddy on some key conservative positions as Mitt Romney, Rudy Giuliani and John McCain."