No, he's a Democrat who infiltrated the Republican party with designs to cause as much havoc as possible.
Leftist Fascism is a religion. I don't think it's too much to believe that there are people willing to live amongst their enemies in an effort to destroy them.
GWB hired an awful lot of infiltrators. Frum, Powell, Ridge, Whitman, McClellan, Richard Clarke, Norman Minetta... he was a good man, but his judgement of character was deeply, deeply flawed.