The election boards in big cities are all run by Democrats. I have read that usually only 50% of registered voters vote. This gives the Democrat "ground game' a lot of 'spare' ballots to work with. And don't forget, unlike Republicans, MOST DEMOCRATS HAVE A DAY OFF ON ELECTION DAY !
Even passwords could be used to get the shills using someone else's ballot through selected poll workers.
Republicans need to wake up and smell the coffee. This can be changed now. The Republican House can stop all legislative work until this is corrected: governing is meaningless if the will of the people is not being carried out.
We have the technology now that can put an end to this: retinal scans can ID voters. Buy a million of them.