Maybe unsubstantiated, but if proven untrue, could hurt the deal and come back to haunt at a parole hearing.
If Davis is certain the charges are untrue, he could have had them unsealed two years ago, giving plenty of time to prove them untrue. This may not swing the election, but it will cost a point or two, and he hasn't reached 50% in the polls yet. Question is, why not? Bush in florida has finally topped 50% without counting undecideds.
I think it just adds confirmation to what everyone believes about Davis;