I’ve always been a fan of mail in voting, so I like the idea.
My guess will be that it will be the Obama campaign that expresses problems, because people have already voted, and in the event of a revote like this, they stand to lose, a lot.
Additionally, as shown by the results in Alabama on Super Tuesday, where a large win resulted in a nearly break even number in delegates for him, the revotes in MI and FL would be stacked against him delegate-wise.
Let me note that this is not evil. This is politics, and Obama is likely to favor something like a caucus instead, because it benefits his campaign.
That’s how political campaigns are supposed to work, to structure the process toward their candidate’s advantage, and absent stuff like Republican style vote suppression, it is neither good nor evil, it simply is, as Mount Everest is, and Alma Cogan isn’t.