Bush was going to lose Michigan in November anyway--the state has gotten more democratic since it went to Gore last time around.
It also is one of the states that has been affected most by the recession and (especially) the loss of manufacturing jobs. Which makes it even more likely he will lose the state.
Still, BushCo would sorely like to win this state, so it's good to hear poll data that reports only 38% of MI residents surveyed would rate Bush's job performance as excellent or good.