Hating on Franken and people like him on the left is the easy out for people like Pee Dee and Federwang to assuage their guilt at taking sides and not trying to present a David Broder-esque "let's all hold hands and be bipartisan, because anything less is illegitimate" front. Being able to say "but I don't like Al Franken or Keith Olbermann either" after ripping into idiots like Rush, Beck or Hannity gives them the illusion of being, dare I say it, FAIR AND BALANCED.
Basically, they're worried about being labeled a partisan so they temper their right bashing with the easy slap at a Franken or an Olbermann. Then Maurice goes on to write a paragraph about how he loves the "boyishly engaged" simpleton Chris Matthews, or how noted loofah enthusiast Bill O'reilly gives him the lulz.