For what its worth, I think there have been a number of serious studies of voter fraud. I believe they only looked at recent elections. None of the studies could identify any significant amount of fraud. This result leads to a question of veracity, I would think , for those claiming there is substantial voter fraud occurring in recent elections. Google it and see what you find.
Personally, I'm not going to get concerned about this issue until some substantial evidence is turned up. I've noticed that very few citizens, myself included, have an excellent grasp of what the requirements are to register and vote in various states, and how those requirement might differ from state to state; yet many seem to think there is rampant fraud particularly when it comes to non-citizens voting. Why is that. How can a person hold such strong opinions about something they no so little about?
An example of a different kind of troubled election would be the 2000 Bush vs. Gore election. There, the issue was a very clear one not involving fraud, but rather a mistake when choosing the type of ballot to be used. That turned out to be an election with a razor thin margin. Florida has subsequently addressed the problem by changing the type of ballot used.
As it turned out, even if the Court had not stopped the hand counting of the ballots in the counties that Gore had asked be hand recounted, Bush would have one. However, had the hand recount been carried out for all Florida counties, it was later discovered, Gore would have one by a narrow margin. The reason a hand count became necessary was because the counting machines could not correctly read ballots whose chads had not been completely detached from the ballots. Gore wanted, and got, a hand recount of just the few counties where the Democrats thought they would run the strongest. Those were the counts the Court halted, but, as we know now, the halt did not change the outcome of the count in those select counties. Had instead, Gore asked for and got a hand recount of the entire State, Gore would have won Florida.
The legal questions raised by the Courts action in stopping the vote recount are a separate issue, and again, not one involving a question of election fraud.