Ace notes this report in the Cincinnati Enquirer:

Hamilton County [Cincinnati] received more than 160,000 documents this year related to voter registration and change of address. Of the more than 40,000 documents received from ACORN, about 10,000 have been duplicates and many have come back with invalid addresses. Of the remaining documents "I do believe fictitious ones are registered," said Williams "We don't cross check this. That's supposed to be done on a state-wide database. So if that isn't done, we don't have the resources to do it."