It's sort of funny that both the Dersh and the actor who helped made him famous - Ron Silver - were long slotted as "liberals" even tho they are/were (Silver's dead) obviously not that!
I remember Silver was put in the "liberal" chair on Crossfire once and he was very uncomfortable. Same thing happened to Jake Tapper.
A different era, but the most liberal you could be on TV at that time was Paul Begala.