How to prevent voter fraud: Head to Oregon and learn about its "vote by mail" process. Make sure all federal elections use that process. Encourage all states to stop voter suppression by use vote by mail. Mandate that Florida use it. Make sure all people have to show photo id...
There were far more people discouraged from voting than there were people who voted illegally, I am sure.
If the vote is a fraud, then how many will trust our democracy. 
Won't happen of course, as our democracy would swing very blue.
Hugh Massengill, Eugene Oregon