They aren't. The people acting might be morons, but the people running it aren't. They wouldn't have created the character if their demographics were showing them their audience were overwhelmingly conservative.
WWE fans, NASCAR fans and GB listeners. Not much to choose from.
Yea, I suppose it would be better to be liberal, and be fans of brilliant people like Hank Johnson, Maxine Waters, Anthony Weiner, Barbara Streisand, Al Franken, Alec Baldwin, Jerry Springer, Michael Moore, Sean Penn, Rosie ODonnell just to name a few brilliant, liberal leaders, and entertainers.