[MrB]

Honest question -

what, really, can a “poll watcher” do to prevent fraud?

And even if they document blatant fraud, has any such documentation EVER overturned an election?

[AlexW]

“what, really, can a “poll watcher” do to prevent fraud?”
________________________________________________

Well, independent outside “poll watchers” can not prevent fraud.
The outside Commie poll watchers are there to intimidate
voters.
You could have “official watchers” outside to make sure that every voter that enters has a voter ID, but it would be up to the inside poll WORKERS to compare the ID with voter records to be sure that each and every voter is eligible to vote.
This is why voter ID is so important.