The 2012 study found that approximately 24 million — or one of every eight — voter registrations were no longer valid or significantly inaccurate. It also found that more than 1.8 million dead people were listed as voters and that approximately 2.75 million people were registered in more than one state. But the report cited no evidence that those errors had contributed to any significant voter fraud. Instead, it pointed to estimates that at least 51 million U.S. citizens are eligible but not registered to vote.