Back in the early to mid '80's, Siskel and Ebert started out on PBS doing a show called something like "At The Movies" (can't remember the exact title). When they got an offer for big bucks from network TV they left PBS, which kept the show's name. To replace Siskel and Ebert, PBS turned to Neil Gabler and (IIRC) Michael Medved.
Guess we know why they liked Gabler; he was a reliable leftist. I think at the time, however, Medved had not yet showed his conservative colors. Maybe he had not yet even realized he was a conservative.
(steely)