I know - that's why I pinged you. Because you're intelligent.
While I agree with him that disagreeing with the statement "the US Constitution is an irrelevant, ineffective mistake" is a Republican position, and while it is probably true that neo-conservatives also would disagree with him on it, I don't think that disagreeing with that asinine comment by him makes one a Republican nor a neoconservative.
It doesn't get any more succint than that.
Pretty much any belief system which is utopian in nature is leftist, even if the adherents of such don't believe it (Erik Von Keunheldt-Leddhin expands on this in one of his books quite well). Such thinking just has no resonance with me.