This is early voting, not really a poll. People are interviewed upon exiting the polls and that data set is linked to the registration data for the precinct. So, there is no data model applied as there is in the polls you are familiar with.
But just because you vote doesn't mean you take the poll. You can easily walk past or say no. It's still a poll, yes it's taken at an election facility, but it is not the same data set as the actual votes
I think the point is that this isn't an advance poll to see how people might vote, where people might end up changing their minds. It's instead people who have just voted saying who they actually voted for.
Gah! Why does everyone bring this up? Was no one around in October 2016?!
James Comey, Director FBI, publicly announced they were reopening the investigation into Clinton's emails, 3 weeks before the election.
Liberals are always saying, "But her emails, hurr!" Yes, her emails. This was explosive news and handed the election to Trump. Doesn't matter that Clinton later faced no consequences, all the public heard was, "Meh. Maybe she is a criminal. We're having another look."
The polls were right, Clinton would have won if not for this absolute bombshell at the 11th hour.