This is probably of interest only to other bloggers, but the old Kaus-Klein feud resumes here around minute 40:00.  Kaus defends the habit of liberals critiquing liberals as stemming from old-time left-wing principles, which means that he’s admitting that the old generation of New Left folks were engaged in their version of the netroots’ rebellion against their perceived enemies among the neoliberals and centrists.  What Vietnam hawks were to them, Iraq hawks are to the netroots, which I suppose is obvious enough.  It’s still a slightly unusual thing for Kaus to say, since it would seem to suggest that the neoliberals were once upon a time just a bunch of young punks toeing the Port Huron party line cluelessly.