In the latest poll,... gave Granholm a 58 percent negative rating
That's usually fatal unless the opponent is just a complete boob.
DeVos doesn't seem to be composed of mammary tissue so far. I've seen a few of his TV ads and been impressed, and he's got some momentum in the legislature for eliminating the single business tax. If the state house can force Jenny to veto a repeal, it'll definitely work to Dick's advantage.