I truly think this is what is skewing the polls, and why they’re overweighting them for Dems.
1. They create chaos in the system and make it harder to catch all the fraud.
2. They inflate the actual Democrat registration numbers. if you have an extra 1.5 million Democrat registrations, the pollsters will accordingly inflate their assumptions of the Dem registration total by 2-4%, giving the impression their candidate is ahead and creating a certain sense of inevitability, which deflates the opposition, both in pavement-pounding GOTV and donations.
3. MOST of the false registrations have REAL addresses, which makes it possible to file for absentee ballots in phony names.
4. The old classic Chicago River Ward scam: With many precincts having only ONE party with election judges or observers in attendance, it is easy for corrupt judges to wait til the polls have closed and then go ahead and vote the “unclaimed” registrations. This is a very old Chicago tradition, I'm sure it is also done elsewhere.