Iowa Democrats had gotten their hopes up, and honestly, how could they not? On Saturday night, J. Ann Selzer—the most renowned pollster in Iowa, if not the entire country—released her final pre-election survey, finding that Kamala Harris was leading Donald Trump by three points in a state the former president had carried by eight in 2020.

The poll seemed to portend a big night for Harris not only in Iowa but across the Midwest, suggesting a surge of support from women that would virtually assure her election. It also found a pair of Democratic House candidates in Iowa leading Republican incumbents, pointing to a Democratic majority in the chamber.

On Monday night, as Democrats packed inside a gymnasium in Des Moines for a rally, Selzer’s survey was all anyone could talk about. “I know that was exciting,” Lanon Baccam, the Democrat running for the local congressional seat, told the crowd, which erupted in cheers at the mere mention of the poll, “but I don’t think anyone in this room is surprised.”

[Read: How to understand the election returns so far]

The following night, many of the same Democrats gathered for a watch party inside a hotel ballroom downtown, their hopes turning to nerves and finally to resignation as a far bleaker picture emerged. The Selzer poll was way off, and Trump was poised to win Iowa by his largest margin ever. Iowa Democrats haven’t had much to celebrate since Barack Obama’s victory in 2012, and last night wasn’t any different.

“Iowa has changed dramatically over the past 20 years. Republicans are in the advantage right now,” Bill Brauch, the Democratic Party chair in Polk County, which includes Des Moines, told me. “We hoped that would change someday, but it isn’t today.”

Democrats had been optimistic about Iowa for the same reasons they were optimistic across the country. After foregoing most door-knocking due to the pandemic in 2020, they had built a robust turnout operation that dwarfed the GOP’s organizing efforts, which Democrats saw little evidence of as they canvassed neighborhoods. Enthusiasm, Brauch told me, was “through the roof.” And indeed, he said turnout was high in Des Moines. But more voters went Republican than Democrats expected, cutting into the margins that Democrats needed to offset the GOP’s strength in rural counties, where Republican turnout was also high.

The dynamic was the same across the country as returns came in: Despite strong turnout in many areas, Harris could not match Joe Biden’s 2020 performance in the counties that powered his victory over Trump. As of early Wednesday morning, the GOP had flipped at least two Senate seats, in West Virginia and Ohio, giving Republicans an all-but-certain majority, and they had a chance of ousting Democratic incumbents in several other battlegrounds that were too close to call. The House landscape was less certain, as Democrats still had a chance to flip enough GOP districts to recapture control.

They needed a net gain of four House seats for a majority, and although some of the party’s best pickup opportunities were in blue states such as New York and California, Democrats began seeing races in the Midwest trend in their direction in the closing weeks, opening up the possibility of more paths to the majority and larger gains nationally. But the Midwest surge did not materialize.

Democrats had poured late money into the two most competitive House races in Iowa, where they saw evidence that voters wanted to punish Republicans for enacting a state abortion ban—one of the strictest in the country—that took effect this summer following months of legal battles. In 2022, low Democratic turnout in places like Polk County helped Republicans flip a House seat, giving them all four in the state. The abortion ban, however, sparked hope among Democrats that Iowa would see the same blue shift that other states saw in 2022 after the Supreme Court overruled Roe—a belief that the Selzer poll reinforced.

Selzer has achieved a near-mythical status among political insiders. On Monday night, when I asked Tom Vilsack, the secretary of agriculture and former two-term Iowa governor, whether he believed her latest findings, he replied with a detailed history of Selzer’s past predictive successes. In 2008, her polling correctly forecast that Obama would defeat Hillary Clinton in the Iowa caucuses, and in both of the past two presidential elections, it came close to nailing Trump’s margin of victory when most other polls underestimated his support. “Anyone who doubts Ann Selzer when it comes to Iowa does so at their own risk,” Vilsack told me. “So do I believe it?” he added, referring to her Saturday poll. “Absolutely.”

On Tuesday night, the Democrats who showed up to rejoice instead realized that Selzer’s survey was just another poll—one of many that appeared to once again underestimate Trump’s support. As the night wore on, they held out hope that Baccam would defeat Representative Sam Nunn, a first-term Republican. (As of this writing, the Democrat in Iowa’s other competitive House race is narrowly trailing with nearly all precincts reporting.) But a podium set up for victory speeches stayed empty, and when, at around 11:20 p.m. local time the Associated Press called the race for Nunn, only a smattering of Democrats were there to see the news.

Brauch, the county Democratic chair, was at a loss to explain how his party fell so far short once more. “I don’t think any of us knows what the answer is,” he told me. “If we did, we’d be doing better tonight.”