Glenn's right that one little paragraph sums up nicely the views of Brooks and many others. It isn't just a conservative thing, either, though I think decades of mostly Republican executive branches has made the club a Republican one.
It's no exaggeration to say that impeachment happened in large part because Clinton was the outsider who "trashed the place." Trashing the place just meant a minor reorganization of the pecking order. Suddenly Lee Hamilton was a tiny bit more important than James Baker, that kind of thing.