Francis Fukuyama, ex-neocon, bloggingheadses with Robert Kagan, the wiliest and best-respected of the neos.

I note, for the record, that Kagan's current kick about the need to revive great power conflict is orders of magnitude more wrongheaded and dangerous than the post-9/11 "let's invade Iraq" fad was. My friend DM likes to say that the one good thing about Iraq is that it distracted the neocons from their even crazier war with China schemes, but now those schemes are making a bit of a comeback.