Supposedly the poll books are public record and can be examined after the election to determine who did or did not vote.
I'm not sure if that is true or not.
Can someone in the know confirm or deny this?
Yes, the poll books are public record. There is a sign in sheet that the voter has to sign before signing the poll book. Poll watchers (volunteers from both parties) visit target polling places to and get copies of those sheets (this is legal) and report back to campaign HQ on which voters have come out to vote. Those that have not showed up get phone calls. Sometimes those calls are harassing.
It’s true.
They will buy the list of who voted in the party primary and target them with mailings and calls before the election.