Bush's approval ratings in Michigan are quite a bit lower than Granholm's, so I doubt there are a lot of "Bush supporting fence voters". Obviously there are some but they would be far outnumbered by the swing voters who oppose Bush.
Right, but I still think it was a wise move on the MDP's part. Do you know why Granholm hasn't endorsed either one?
No, I can't say that I do know. Obviously a lot of ads are run without the direct approval of those they are designed to benefit, but I don't know the reason in this particular case.