While I strongly support Voter ID laws, I don't think they will solve the whole problem. The case of the Maryland Congressional candidate who regularly votes in two states is a case in point. We need a national database. That way, when you move, your previous registration is wiped out when you register in your new home and you wouldn't be registered in multiple state or districts. It would prevent people who own vacation home from voting with both addresses (one in person and the other by absentee) and it would prevent college students from voting with their home and school addresses.