A poll watcher in Michigan said he saw a poll worker have a ballot come in, and assign it as having voted to someone in the data base who had not voted.
If you know who will not vote (dead, moved away, etc) you could assign votes to those people.
If you know who will not vote (dead, moved away, etc) you could assign votes to those people.
Yes, you absolutely could. But you can't do it 138,000 times.
That level of fraud requires a higher level access than the lowly poll worker. And it's that level of fraud that is behind the whole "vote by mail" plan. All of those ballots could be assigned to people who are still on the rolls but haven't voted in many election cycles. After the polls close, run your fraud list name against the in-person voting, and you can figure out how many ballots you can run through the system.