Herr Perfesser: Filthy Liar
Josh Marshall has the "dark and shameful" details.
Update: (I'm slow on the uptake here--Atrios linked to this hours ago. But I'm going to leave it up anyway. I like the look of it.)
Update 2: Digby's got great post up on this topic, and Atrios has more .
Update 3: Roy Edroso dramatizes the case nicely.