He is writing in a national newspaper about a concept ("the unitary executive") which he, from the context, clearly does not understand.
I used to respect Bob Barr, but he seems to be full of himself, much like a large-eared candidate from Chicago whose middle name is Hussein.
The way I see it, I can decide to vote for McCain for whatever reason I decide is important to me. I don’t need Bob Barr to tell me why my reason is not valid.