But IMO Imus is serious about his loathing of Palin and Congresswoman Bachmann -- as well as, he does in fact strongly dislike some Republicans but he did support what's his name last year.
BTW I started listening to Limbaugh when he first went on the air with a local talk show in Sacramento. Even then he said -- and in fact it was true for me -- that it would take a couple of weeks to "get it."
Long before he ran for president, Romney proved to be a surprisingly quick-witted guest on Imus's show. It would not surprise me if they were friends.
Regarding Imus and politics, let's remember the glub-glub-glub sound effect that Imus always played whenever he mentioned Ted Kennedy. I'm sure it lost Imus some liberal fans.