Every election cycle brings the same ritual: losing campaigns and their supporters attack the polls. The criticism, as always, comes mostly from the losers. But the reality is that polling quality varies sharply. Some firms produce reliable data; others are little more than guesswork dressed up in numbers.
The core challenge for any pollster is twofold: securing a random, representative sample and making judgment calls about likely voter turnout. In tight races, a few bad assumptions can flip the outcome. Critics and even many journalists covering polls rarely understand the mathematics of sampling, voter behavior, or what a poll actually measures. A poll is a snapshot in time, not a prediction. For instance, a University of New Hampshire survey in early September showing John Sununu ahead of Senator-elect Chris Pappas wasn't necessarily wrong—it captured sentiment at that moment.
Undecided voters complicate accuracy. Even on election eve, a small share remains undecided, and their eventual choices—or failure to vote—shift the final percentages. Thus, an accurate poll will typically understate both candidates' final totals. A poll within one point of the result is strong; a miss at the top of the margin of error (2.5 to 4 points) is poor; anything beyond that is a serious failure.
Where do undecideds go? Usually to the challenger or the party out of power. Voters who are satisfied with incumbents tend to stick with them early. Campaign operatives have long held that an incumbent polling under 50 percent heading into Election Day is vulnerable, regardless of the opponent's numbers. Late-campaign switchers are rare absent a major shock.
Judging pollsters requires nuance. A poll that gets the direction wrong can still be more accurate than one that gets it right by a fluke. In Mississippi's Senate race—where Democrat Scott Colom appears to have won 49-49—a late poll showing Republican Cindy Hyde-Smith leading 48-47 was closer to reality than one showing Colom ahead 51-48. Good polls should show both candidates below their final totals, with the challenger's underestimate more pronounced. Overestimates of more than one point are a red flag.
Using RealClearPolitics' summary data—which filters out fly-by-night operators—the standout performers were The New York Times and AtlasIntel. Both called every race correctly except South Carolina, where the Times had a 48-48 tie. But the Times' late polls rarely overestimated candidates. Their Michigan poll had Abdul El-Sayed at 53 percent (final: 52.5) and Mike Rogers at 42 percent (final: 45.5), a miss that likely reflects undecideds breaking for Rogers. The Times also nailed Ken Paxton's dismal 43 percent in Texas—a race where no undecided voter seemed willing to back him.
AtlasIntel performed well on direction but lagged the Times on accuracy, occasionally overstating percentages. That's fine for a projection but not for a pre-election poll, which should lag final totals. Among Republican-leaning firms, Rasmussen had notable misses: it gave Annie Andrews a 3-point lead in South Carolina (final: 51-47 for Graham) and put Josh Turek ahead of Ashley Hinson in Iowa (final: 51-46 for Hinson). Trafalgar also missed South Carolina but had Graham at 48 percent—a reasonable miss—and produced one of the best early polls of the cycle, showing Graham leading only 43-42 in late September, correctly signaling her vulnerability.
The worst performances came from Emerson and Quantus. Emerson absurdly had Paxton leading James Talarico by 2 points; the final margin was 12 points. Emerson also fumbled Maine, putting Susan Collins ahead 51-49, but Jackson won 53-47. Quantus had Paxton up by 1 and Trafalgar called it a tie. Everyone got Kansas right, but Minnesota stumped all—they called for Peggy Flanagan but overestimated Michele Tafoya.
Finally, the Big Chicken Award goes to Marist, which in early polling gave Democrats huge leads in Iowa, Michigan, Ohio, and Texas—leads that evaporated as Election Day approached. As the GOP faces its own post-midterm reckoning, polls will remain under scrutiny, but the lesson is clear: not all pollsters are equal, and the best ones are those that respect the limits of their craft.
