The Cook Political Report announced on October 6 that it is moving the Kansas U.S. Senate race from "Lean Republican" to "Toss Up" — one of three Senate races the forecaster shifted toward Democrats that day, alongside North Carolina and New Hampshire. Kansas last elected a Democratic senator in 1932, when George McGill won reelection — 94 years ago. A Republican loss here would be the first in nearly a century.
Seeking reelection is Republican incumbent Sen. Roger Marshall, a former OB-GYN who won his first term in 2020 by more than 11 points. The challenger is Democrat Adam Hamilton, a United Methodist pastor who won his party's nomination in August. Running as a centrist focused on unwinding tariffs and regulating data centers, Hamilton has secured endorsements from two former Republican governors. The general election is set for November 3.
Multiple recent polls show the race knotted. A New York Times/Siena College poll released over the weekend had the two tied at 45% each among likely voters, with Libertarian David Graham at 5%. A Global Strategy Group (Democratic) poll put Hamilton ahead 47% to 43%, while a YouGov survey showed Hamilton leading by 3 points. Polling averages now give Marshall a lead of only about a point.
The shift has real roots. Drought hammering crops and elevated fuel and fertilizer costs have soured farm voters. Meanwhile, an old liability resurfaced: a September New York Times report found that during his medical career, Marshall sued 700 patients over unpaid medical bills, leading to 81 arrests, with debts ranging from several thousand dollars down to as little as $101. CNN's analysis of the polling also found that between 9% and 16% of Republican likely voters in five key states said they'd back the Democratic nominee — with crossover voting most pronounced in Kansas.
The tightening race is forcing Republicans to spend defensively. A Senate GOP political action committee has reserved $14 million in advertising for Kansas, and the Senate Leadership Fund booked roughly $8.2 million in ad time — money that could otherwise target traditional battlegrounds. A Democratic pickup in Kansas would substantially ease the party's path to the four-seat gain needed to retake the Senate majority.
Less than a month remains. Forecast models stay cautious: Pollsmax gives Marshall an 89.8% chance of winning and rates the race "Likely Republican," but the polling trend is moving against the incumbent. In a deep-red state Donald Trump carried by 16.1 points in 2024, a Senate race rated "Toss Up" is already one of the biggest surprises of this midterm cycle.