Actually, I kind of understand the liberal outrage. Lehrer and Shields have been ultra-reliable shills for the dems for 30 years. To some on the left, this must seem like a betrayal of the worst kind.
But it reality, this seems to me to be just more intramural rivalry amongst various factions on the left. Yes, Shields and Lehrer are attacking a dem. But the beneficiary will be HRC, not W. So they are still reliably on the plantation.
The moonbats on the street don't realize this is just maneuvering for 2008 and they feel betrayed.
I think you're right.