The airwaves and front pages are thick with forecasts of a Democratic sweep in next month's midterms. USA Today has floated the possibility of a blue wave that could flip both chambers, while HuffPost muses about "historic victories." But a hard look at recent polling track records suggests voters and pundits alike should temper their expectations.
Pollsters have a well-documented history of missing the mark, and the misses are not random. In 2024, they underestimated Donald Trump's support for the third straight presidential election, with his vote share climbing from 63 million in 2016 to over 77 million in 2024. Trump isn't on the 2026 ballot, but he's urged his base to vote as if he were, and his gravitational pull on Republican turnout remains a factor that surveys may not fully capture.
Beyond Trump, the collective record is troubling for Democrats. Washington Post polling director Scott Clement has noted that surveys have overstated Democratic support in five of the last six national elections. If that pattern holds in 2026, even a 3-point average overestimation could mean Democrats take the House but fall short in the Senate. That's a razor-thin margin between a wave and a washout.
Even the most celebrated pollsters have been humbled. In 1936, Literary Digest, the gold standard of polling, predicted Alf Landon would beat FDR; instead, FDR won in a landslide. More recently, J. Ann Selzer, lauded as the "queen of polling," released a final Iowa poll in 2024 showing Kamala Harris ahead by 3 points. Trump won the state by 13, a 16-point miss. Selzer's reaction was candid: "Polling is a science of estimation, and science has a way of periodically humbling the scientist."
Major media polls have also been suspect. In the final weeks of the 2024 campaign, CNN, The New York Times/Siena College, and Marist all showed Harris leading in enough swing states to win the Electoral College. Trump swept all seven. National polls were similarly off, with Marist showing Harris up 4 points when she lost the popular vote by 1.5. These aren't minor discrepancies; they're systemic challenges in capturing the electorate.
The 2022 midterms offer a cautionary tale of a different sort. Pundits predicted a "red wave" for Republicans, driven by inflation, border chaos, and Biden's sagging approval. Instead, Democrats gained a Senate seat and held the House to a narrow GOP majority. That unexpected resilience helped convince Biden to seek reelection, a decision that unraveled after a disastrous debate and ultimately changed the course of the 2024 race.
None of this guarantees that Democrats will be disappointed this year. Polls could be right, and a blue wave might materialize. But the evidence from recent cycles suggests that confidence in pre-election surveys is often misplaced. As Nate Silver put it, approaching polls with "more-than-mild skepticism" is not unreasonable.
For Democrats, the stakes are high. A misplaced belief in a wave could lead to complacency, while Republicans are already warning of a money surge that could tip close races. The lesson from 2022 is that expectations often don't match outcomes. Voters, not polls, decide elections, and they have a habit of surprising the experts.
