Probably, but some Dems will vote for Huck as a dirty trick and other Dems will vote for Huck as the candidate for End Times (big in Mich). Hard to poll.
If Huckabee wins MI for those reasons, the polling will clearly bear it out, and MI will be invalidated completely in the public eye. If that’s the case, the damage to Romney would be minimal, and I think his campaign would survive credibly.
After all, it’d be a great line against Huckabee: He never loses the Democrats’ vote.
The same thing could be used against a McCain victory, but it would probably not be as effective.