Ignore the Polls

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 Public Opinion Research postmortem found that the average error of the national polls was 2.2 points, but the polls of individual states were off by 5.1 points. In 2020, the national polls were off by 4.5 points and the state-level polls missed, again, by 5.1 points.

You could imagine a world in which these errors are random and cancel one another out. Perhaps Donald Trump’s support is undercounted by three points in Michigan but overcounted by three points in Wisconsin. But errors often systematically favor one candidate or the other. In both 2016 and 2020, for instance, state-level polls tended to undercount Trump supporters. The polls overestimated Hillary Clinton’s margin by three points in 2016 and Joe Biden’s margin by 4.3 points in 2020.

In a blowout election, an error of a few points in one direction or another is meaningless. In the California Senate race, for example, Adam Schiff, a Democrat, is leading Steve Garvey, a Republican, by between 17 and 33 points, depending on the poll. Even a polling error of 10 points wouldn’t matter to the outcome of the race.

But that’s not where the presidential election sits. As of Oct. 10, The New York Times’s polling average had Kamala Harris leading Trump by three points nationally. That’s tight, but the seven swing states are tighter: Neither candidate is leading by more than two points in any of them.

Imagine the polls perform better in 2024 than they did in either 2016 or 2020: They’re off, remarkably, by merely two points in the swing states. Huzzah! That would be consistent with Harris winning every swing state. It would also be consistent with Trump winning every swing state. This is not some outlandish scenario. According to Nate Silver’s election model, the most likely electoral outcome “is Harris sweeping all seven swing states. And the next most likely is Trump sweeping all seven.”