- Paul Begala: "David Broder is a Gasbag."
- Oliver Willis: "Democrats United: David Broder Is An Ass" (bonus amusing illustration.)
- No More Mister Nice Blog: "Utterly Lacking in Basic Comprehension of the Simplest Facts."
- AmericaBLOG: "David Broder is a Loser."
Those are hardly the only responses, though they are indicative.
In related news, Bill Moyers put together a special on this sort of punditry and how it landed us in a war. Oh, and Glenn Greenwald has been writing about it for about forever.