It is way too early and if Fred Thompson comes into the race look out Rudy! Too early the election is not until next year. People do not even care, only the guys running and the political pundits , and of course 24 hour news.
Fred is no threat to Rudy. To those to his right: Romney, Newt, Hunter etc. he is a BIG threat since he will draw votes from them and lesser amounts from Rudy.
It is funny that people do not realize this or that having Fred enter the race will actually help Rudy by weakening all his opponents. Fred might pass McCain for second place but that is about as far as it will go leaving Rudy with a 10-15% lead.