The key word is "recently" been the star of a sitcom
The only one I can think if is Kelsey Grammer from Frasier .. but I believe he is a republican
Kelsey didn't have any horrific family violence, he has more money than Ben Stein and he is not hiding his Republican views. I don't think it's Frasier.
I included more of the text, and it puts the sitcom part in context, that this guy was mean and threatening towards Ben Stein, thereby revealing him as a liberal 'Rat. That leaves out guesses like Cosby and Grammer, it would seem.
Can you think of a sitcomer, with a family violence factor, who is a lib-Dem Republican hater?