O'bama who?
If the Democrats pursue issue of the "state investigation," it won't get much traction. For one thing, most Americans won't understand, and for another, the McCain campaign will have fleshed that out enough to give a coherent response. Besides that, the worst Sarah Palin can be accused of is belated action. This will be a non-starter, and pursued too vigorously will make the Democrats look bad.
Steve