He is the very definition of "country club Republican." He didn't used to be, though. He was a strong Reaganite in the early 80s. He got caught helping Reagan prepare for the 84 debates, and was chastened, and has not been the same since.
Didn't he also get a lot of grief because his wife was working in some way to help either Bush '41 or '43. I just remember somewhere in the deep recesses of my brain something about this.