Here’s a bit of advice to help maintain your sanity over the next few weeks until Election Day: Just ignore the polls. Unless you’re a campaign professional or a gambler, you’re probably looking at them for the same reason the rest of us are: to know who’ll win. Or at least to feel like you know who’ll win. But they just can’t tell you that.Back in 2016, Harry Enten, then at FiveThirtyEight, calculated the final polling error in every presidential election between 1968 and 2012. On average, the polls missed by two percentage points. In 2016, an American Association for...