McCain is old. Crist looks old but young enough to cause significant damage and the OLD GUARD republicans are for Crist (handful). The new dynamos of the party like Ryan are for Rubio.
McCain has to go. I am very happy that FL is taking out the garbage. I think UT and PA will also take out their garbage (Bennett & Specter).
AZ has to dump McCain. He has caused far more damage to Conservatives than Crist. I loathe Crist but McCain is worse.