As I mentioned above, how exactly would we find the resources to investigate the example I gave you? The answer is that we can't. Everyone could cast a vote for a registered voter who happens to be demented and in a nursing home, for example.
Did you know you can register to vote at the same time you go to cast your vote? Did you know that many states don't even require an state or federally issued id, just a utility bill with you name and address on it? Did you know that you don't have to prove citizenship at that time, just sign a document to attest that you are indeed eligible to vote? Now, lets put on our thinking caps for a minute. How hard would it be to show up at one of these voting stations with a utility bill from some random that may not even vote and to sign an affidavit in that person's name? The answer is, it would be SUPER simple. The hard part would be how would we go about finding this fraud? The man power would be ridiculous. All of this could be solved rather simply, but you and others like you don't want to fix it. Frankly, your take is just plain stupid, unless you intent is to make our elections insecure.