Here in California, voters don't have to provide any proof of identification. Tell me what a poll watcher is supposed to do about that.
Michigan also has noID required.
With or without ID, I think most states require the voter fill out a form that has personal info (DOB, address, phone, etc.) before he can vote.
Poll workers are supposed to verify the info on the form with the info in the offiial log of registered voters. Challengers can ask to witness this comparison - challengers have a RIGHT to view any and all pages of the book of registered voters and the info on the would-be voters form. If the inof does not match, a challnger can demand that ballot be marked as challenged with a note as to why. If the election is close, that ballot can be open to legal challenge and possibly voided.
Things to look for: a group of voters arriving together as a group - check the info on their forms very closely - it may just be a DemonRAT vote-fraud-squad (in their case their squads try to commit the fraud rather than prvent it).
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