True about Geer, but let’s not confuse the actors with the characters.
On this point I'd like to add that I think 30 Rock's Jack Donaghy is one of the most entertaining and well-written conservative characters on television, easily stealing every scene he's in. Of course, the actor who plays Donaghy is Alec Baldwin, a major Hollywood lib.
Though I've got to give Baldwin credit for playing Donaghy as the straight man on the show and not as a buffoon.