I subscribed to her magazine when she was in prison as a show of support; I also thought the incarceration was wack. But when she publicly bashed Dubya after she got out, I took great pleasure in cancelling my subscription.
That's Martha for you. She gets support (deserved) then manages to open Big Mouth and lose said support. That's my read of her. She did avoid every vestige of politics on her program--it simply was not germane to her show. Prison changed her, obviously.
I've watched her for YEARS because I like what she does, but I realize I'm only seeing the "T.V. package" persona that she wants us to see.