The fraudulent registrations never made it past ACORN's screening process. They flagged all of the questionable registrations and handed them over to the authorities as they were required to do by law. There was never any danger that the fraudulent registrations would result in someone voting illegally, and therefore there was never any assault on anyone's right to vote. That's just Republican smear mongering, and a part of the pattern of Republican efforts to disenfranchise large numbers of voters, which is itself a form of election fraud.