Cait Conley, an Army veteran and former national security official in the Biden administration, beat Representative Mike Lawler in a suburban New York swing district, according to The Associated Press, flipping a seat that Democrats had identified as a top target on their path to recapture the House majority.
Ms. Conley rode a wave of voter dissatisfaction with the policies of President Trump, whose tariffs and war in Iran have contributed to higher prices on gasoline, groceries and other essentials.
“We started this because we knew that America, the land of promise and opportunity, was on the wrong path — but we knew, if we came together, if we brought people together, that we could fix it,” Ms. Conley said late Tuesday at her election night watch party in Pleasantville. “And tonight we show that this fight wasn’t a partisan fight. This was a patriotic fight.”
The race was not called until Thursday afternoon, partly because of issues with the processing of ballots in Westchester County, which delayed the counting of tens of thousands of votes.
But long before the results were official, Ms. Conley’s strong performance in Mr. Lawler’s home base in Rockland County led the congressman to concede.
Speaking at a banquet hall in a Hilton hotel in Pearl River on Tuesday night, Mr. Lawler said that he had called Ms. Conley to congratulate her and that “when all the votes are counted tomorrow in Westchester, it will be pretty clear.”
The daughter of a postal worker, Ms. Conley grew up just over the border of the district, New York’s 17th, which includes the affluent suburbs north of New York City and narrowly favored former Vice President Kamala Harris in the 2024 presidential election. Ms. Conley moved back to run for Congress and talked up her years of military service on the campaign trail, beating two more liberal primary opponents in June.
Still, her work in the private sector after leaving government became the subject of attacks from Mr. Lawler and outside groups supporting him. They bankrolled television advertisements that portrayed Ms. Conley, a former U.S. Army special operations leader, as a corporate puppet beholden to her former employers.
Ms. Conley made $328,000 in nearly two years of private-sector work, according to financial disclosure reports, but declined to divulge the specifics of what she did for Hidden Level, an anti-drone-systems company, and for Primer AI, the firm where she consulted, citing nondisclosure agreements.
The two campaigns and outside groups backing them spent more than $60 million inundating voters with advertising over the course of the campaign, according to AdImpact, an ad tracking firm. About half of that money went to supporting Ms. Conley, with much of it spent on ads attacking Mr. Lawler as a rubber stamp for Mr. Trump. “Mike Lawler votes with Trump 100 percent of the time,” a narrator states in one of the Conley campaign ads. (An analysis by Congressional Quarterly found that in 2025, Mr. Lawler voted yes on bills Mr. Trump approved of 94 percent of the time.)
A former state legislator, Mr. Lawler shot to fame when he unexpectedly defeated Sean Patrick Maloney, the chairman of the House Democrats’ campaign arm, in 2022. That victory, and his re-election two years later, distinguished Mr. Lawler as a Republican who could win in a resoundingly Democratic state.
The congressman, who flirted with a run for governor last year, went to great lengths to emphasize his independence. He was a lone Republican voice during negotiations over Mr. Trump’s signature domestic spending bill, conditioning his support for the legislation on raising the cap on the state and local tax, or SALT, deduction. (Ms. Conley had argued that there should be no cap on the deduction, and criticized the fact that the legislation that lowered taxes also cut funding for Medicaid.)
Mr. Lawler also characterized Ms. Conley as aligned with Mayor Zohran Mamdani of New York City and Representative Alexandria Ocasio-Cortez, both democratic socialists.
One exchange during the first debate of the campaign summed up the race’s fault lines. Mr. Lawler called on Ms. Conley to denounce Mr. Mamdani, whom he claimed was encouraging antisemitism.
“I absolutely call out my party when I believe that it’s wrong,” she said.
“But you don’t denounce Zohran Mamdani,” Mr. Lawler replied.
“Have you denounced Donald Trump and the harm that he has caused to our families here in the Hudson Valley?” Ms. Conley said in response.
The voting problems in Westchester County were the product of human error, officials said, but they nonetheless unsettled voters and poll workers on Tuesday. It turned out that the county had updated its ballots and the software for its ballot-reading machines to add an omitted race in Ardsley, N.Y. — but the software change had been made only in Ardsley, meaning the machines in the rest of the county were unable to read the updated ballots.
Ballots across the county were deposited into orange bags and delivered to a county Board of Elections facility in Ardsley, where a count, under the supervision of lawyers, began late Wednesday morning.
At the facility on Wednesday afternoon, a Democratic elections commissioner, Tajian Nelson, declined to give an estimate when reporters asked when the counting would be finished.
“We’re not even able to begin with the E.T.A.,” she said.
But she added that, by law, the election results must be certified within 25 days. “So based on that, we have to be certified before we have turkey at the end of the month.”
Kristi Berner and Wesley Parnell contributed reporting from Westchester County.
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