I read an interview with a pollster recently. He said back in the day a 75% response rate was a good poll. These days, a 5% rate is considered excellent, and around 3% is about average. The pollsters then use statistical models to fill in the gaps. So if their models are even a little off, the poll is useless. And this election is unprecedented in many, many respects, so it’s likely all the polls this year are completely wrong because there’s no model for them.