Democrat Adam Hamilton has secured a stunning victory in Kansas, defeating Republican Senator Roger Marshall for a U.S. Senate seat. The Associated Press called the race for Hamilton at 11:25 p.m., ending a nearly century-long streak of Republican dominance in the state for this position, as no Democrat had won a Senate seat in Kansas since 1932.

President Donald Trump made a final effort to support Marshall's campaign, traveling to Salina, Kansas, just two days before Election Day, after initially canceling a planned rally and suggesting Marshall was performing well. Vice President JD Vance also made multiple trips to the state to campaign for the incumbent.

Trump's visit was a reversal after concerns arose about his earlier decision to cancel an event. The RNC had indicated that Trump would hold virtual events, but he ultimately reversed course, reportedly due to the optics of the cancellation.

The race saw significant spending, with Republican groups committing over $26 million in advertising after the August primary to aid Marshall. Democratic groups, meanwhile, invested more than $38 million. The total advertising expenditure reached approximately $71 million, setting a record for Kansas.

Marshall's campaign characterized Hamilton as "too woke and too weak for Kansas" and criticized him as an extremist. An advertisement from the Senate Leadership Fund also attacked Hamilton. Marshall's campaign also drew attention to how Hamilton's church handled abuse allegations at youth camps in 2005 and 2006. Hamilton stated that the incidents were reported to the police and that he ensured the abuser's conviction.

Hamilton's campaign highlighted a woman's account of being arrested over Marshall's medical debt collection practices from when he worked as a doctor. Marshall's lawyers issued a cease-and-desist letter regarding this advertisement, which Hamilton dismissed.

Hamilton, a Methodist pastor, centered his campaign on economic frustrations, particularly the rising costs of fuel and fertilizer affecting Kansas farmers. He also garnered support from independent voters and some moderate Republicans, contributing to the race's competitiveness.

Marshall, who has served in the Senate since 2021, ran on continuing Trump's agenda and warned of a Democratic takeover of the chamber if his opponent won. Trump had previously won Kansas by over 16 points in 2024, making Hamilton's victory a significant upset in a state typically considered a Republican stronghold.

In an effort to address voter concerns, Marshall released a campaign video explaining his former medical practice's approach to collecting unpaid medical bills, noting that while free care was often provided, overdue accounts were sometimes sent to collection agencies to ensure the practice's viability. This video was reportedly released without the knowledge of some senior campaign advisors who had advised against revisiting the issue close to the election.