Fred Thompson may not officially toss his hat into the ring until May, June or even July. If he is polling this well already, why should he hamstring himself? He is filling in for Paul Harvey for three weeks, so his on-air personality will gain him more exposure. Let him gain traction, then when he runs, he will quickly rise to the top.
I'm thinking April-May...he's going to D.C. mid- April to talk...