It's been difficult over the last few years to differentiate the degrees of hackdom in the conservative movement. It's been sort of like differentiating the colors on the SNL parody terror alert chart - off-white, cream, putty, bone, and natural - as there's been so little variation. There have been disagreements in wingnuttia, but even when some found fault they never found fault with Bush himself.
But I probably would've put money on Brit Hume being the single biggest Bush hack in all of the land of wingnuttia. Even the National Review is peeved.