Caruba's faux surprise at the President's policies is weak. George W. Bush has always been pretty transparent about his beliefs and priorities. If they don't correspond with Caruba's priorities, well then he should support someone with whom he does agree. There were plenty of indications in President Bush's first campaign that not all of his ideas were thoroughly conservative, e.g. "no child left behind," willingness to sign "campaign finance reform," etc. What conservatives (and all other citizens) have to do is decide in a political campaign what course of action best serves your beliefs and interests. Being "shocked" by actions which were apparent in advanced is a very poor argumentation. Undercutting what remains our best hope for the future (especially, in the naming of appellate and Supreme Court justices) is counter-productive
That's basically what he's doing. He's criticizing Bush for liberal policies, so he's withdrawing unqualified support.