Two guys here in Pennsylvania tried to vote illegally for Trump last presidential election and were arrested for voter fraud. The one guy tried to vote for his dead mother and the other guy tried to vote for his son wearing a disguise. If the person you mentioned did vote multiple times, it would have only been counted once. That's how the systems work. Mass voter fraud is just a myth that's been debunked over and over again. It's honestly tiresome. People need new tricks. Work hard.