It's true that Bush has been almost uniquely incompetent among modern
presidents. But the real failure of the Bush years is a fundamental failure of
ideology. For the first time since 1932, conservatives have controlled every
branch of government. They had a chance to show they had a real governing
ideology, and it turned out they didn't.
So: Are George Bush and Tom DeLay and Bill Frist real conservatives? Of
course they are. They've failed because of that, not despite it.
For other takes on this theme, see my review of Bruce Bartlett's
Impostor here
and Jon Chait's takedown of conservative apostacy here.