This "voter fraud" business has been the subject of amounts of media coverage, official investigations and online discussion over the past twenty years. See The Voting Wars by Richard Hasen, an elections lawyer who devotes a chapter to "The Fraudulent Fraud Squad." The W Admin spent its whole time in office hunting for voter fraud, even fired USAGs for failing to take that seriously, and never found any. And neither has anybody else, except for a few fraudulent votes cast in all cases by Republicans for Republicans, and even those never in sufficient numbers to affect the outcome of any election. It's a non-problem.