Democrat Adam Hamilton has delivered a historic upset in Kansas, winning a Senate seat for his party for the first time since 1932 and bringing the state’s decades-long Republican run to an end.
Hamilton edged out Republican Senator Roger Marshall in a fiercely contested race, disrupting the GOP’s hopes of preserving its Senate majority.
The Associated Press declared Hamilton the winner at 11:25 p.m.
President Donald Trump made a final effort to bolster Marshall’s campaign, traveling to Salina, Kansas, on Sunday—two days before voters went to the polls.
Vice President JD Vance had also visited Kansas twice to campaign on behalf of the incumbent senator.
Trump’s appearance followed a sudden reversal after criticism of his decision to call off a rally planned for October 29.
The Republican National Committee had maintained that Marshall was in a strong position and said Trump would take part in virtual events instead.
Trump had likewise said Marshall was doing “really well” and suggested there was no need for him to make the trip to Kansas.
But he changed course the next day, restoring the in-person rally after becoming concerned about the political optics of canceling it.
Democrat Adam Hamilton secured a stunning upset victory, winning by more than 100,000 votes
Hamilton, a prominent Methodist pastor, focused his campaign on voter frustration over rising living costs, including soaring fuel and fertilizer prices affecting farmers throughout Kansas
Marshall, who has served in the Senate since 2021, promoted his support for Trump’s agenda and warned that a Hamilton victory could give Democrats control of the chamber
Republican campaign organizations spent heavily in an effort to prevent Marshall from suffering a major defeat.
Following the August primary, GOP groups pledged more than $26 million in advertising for Marshall—surpassing their total spending on his 2020 campaign.
The spending surge came as some Republican strategists argued that Marshall had underestimated the threat facing his reelection bid.
Hamilton and Democratic organizations committed more than $38 million of their own, pushing overall advertising spending in Kansas to approximately $71 million—a record for the state.
Marshall’s campaign repeatedly branded Hamilton “too woke and too weak for Kansas,” while an advertisement from the Senate Leadership Fund called him a “two-faced” extremist.
Another Republican ad questioned Hamilton’s church leadership over its handling of abuse allegations at youth camps in 2005 and 2006.
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Hamilton responded that the incidents had been reported to police and said he personally helped make sure the perpetrator was convicted.
Hamilton’s campaign countered with an advertisement featuring a woman who said she was arrested over medical-debt collection practices connected to Marshall’s work as a doctor in western Kansas.
Marshall’s lawyers sent a cease-and-desist letter, which Hamilton dismissed as ridiculous.
The Democratic challenger, a prominent Methodist pastor, focused much of his campaign on economic frustration, particularly rising fuel and fertilizer prices that have squeezed farmers across Kansas.
He also attracted support from independent voters and some moderate Republicans, helping make the contest far more competitive than expected.
Marshall, who has represented Kansas in the Senate since 2021, campaigned on continuing Trump’s agenda and warned that a Democratic victory could hand control of the chamber to the opposition.
Trump carried Kansas by more than 16 points in 2024, making Hamilton’s victory a major upset in a state that has traditionally been a reliable Republican stronghold.
In a last-minute attempt to defend his record, Marshall released a campaign video explaining why his former medical practice pursued patients over unpaid medical bills.
Marshall said his office frequently provided free care but occasionally turned unpaid accounts over to collection agencies to keep the practice running.
However, the video was reportedly filmed and released without the knowledge of some of his senior campaign advisers, who had urged him not to revisit the controversy so close to Election Day.
Marshall later said voters had repeatedly asked him about the issue and that he wanted to explain his side.
The senator’s victory comes after the race tightened dramatically in the final weeks, turning what is usually a safe Republican seat into one of the country’s most closely watched contests.
Trump carried Kansas by more than 16 points in 2024, but Hamilton’s centrist campaign and voter concerns about the economy helped make the race more competitive than expected.
Hamilton, a prominent Methodist pastor, sought to capitalize on frustration over rising costs, including higher fuel and fertilizer prices that have hit farmers across the state.
He also attracted support from some moderate Republicans and independent voters.
Marshall, who has represented Kansas in the Senate since 2021, campaigned on continuing Trump’s agenda and warned that a Democratic victory could hand control of the chamber to the opposition.
Kansas has not elected a Democrat to the Senate since 1932, making the close contest an unusual test of Republican strength in a state Trump won comfortably.