Frist is in an extremely tough position. My question is, How does he "punish" RINOs when he will still desperately need their votes?
I believe the parties have their own rules about what the majority/minority leader can do. A number of posters mentioned LBJ as an effective (if reprehensible) Senate majority leader, and I am quite sure it was not his personal charm and magnetism that kept his guys in line. I suspect Republican rules allow for less "tyranny" (which we could use a bit of!).