Another good reason for requiring ID at the polls. Apparently, some county clerks have been, er, less than diligent in purging their voter rolls. As a result, some jurisdictions have more registered voters than the 2003 Census estimate of the voting-age population. About 55,000 appear to be registered more than once, many times in multiple counties. Some registered voters have either moved away died.
While the ID requirements makes it harder to vote regularly, there's nothing that keeps someone from voting provisionally as one of these improperly registered voters without ID. The standard for counting a provisional ballot is that the person is registered; they are assumed, after the fact, to be properly registered.
Nobody wants to ask this question, but how many of these new registrants might not actually be citizens?