If you really do listen to Rush every day, you must have heard him say that he is NOT the spokesman for the GOP. He is a conservative, first and foremost. There is no way Rush would have any part of such a scheme. Besides, Huckabee is doing a pretty good job of knocking himself off lately.
I do listen to Rush nearly every day and have since a station around here put him on the air. ('89?) Rush has changed a great deal since I first heard him. Yes, he says he's a conservative first, but for a long time, he has been more careful of how critical he is of Republicans in general. He never paints himself into a corner anymore so he can support any RINO with an "R" behind the name, if need be. If you can see no difference in his tone over the years, maybe you haven't listened to him as long as I have.
I like Rush a lot or I wouldn't continue to listen to him, but I don't trust him implicitly and I don't always see things as he does. And I agree with you that Huckabee is not ready for prime time and appears to be sabotaging his own campaign with senseless errors.