Kansas Senate Race Dead Even in Polls, But Prediction Markets Still Favor GOP's Marshall 2-to-1

Four weeks out from Election Day on November 3, the Senate battleground map has grown. CNN's running list of the Senate seats most likely to flip now includes 10 states instead of nine, with Kansas added for the first time this cycle, according to CNN's own reporting.

Kansas has one of the longest Republican winning streaks in the country. Newsweek reports the seat has been held continuously by the GOP since 1919, the longest run for any party in any state. Yahoo News and CNN frame the streak differently, noting Kansas hasn't elected a Democrat to the Senate at all since 1932, a 94-year drought. Both numbers are sourced and both describe the same underlying reality: Kansas Republicans have not lost a Senate race in living memory.

That streak is now in question. Republican Sen. Roger Marshall, an OB-GYN first elected in 2020, is facing Democrat Adam Hamilton, senior pastor at one of the country's largest Methodist parishes. An Emerson College-Nextstar Media poll has Hamilton up two points. A New York Times/Siena poll from last month had Marshall at 47 percent to Hamilton's 46 percent, inside the margin of error either way. The Cook Political Report still rates the race Lean Republican but describes Hamilton as running an "increasingly strong race."

Prediction markets, though, aren't buying the polling story. On Kalshi, Marshall was sitting at 66 percent to Hamilton's 34 percent as of Monday night. Polymarket had it even wider, 68-33 for Marshall. That's a real divergence between what bettors think will happen and what the polls currently show, and it's unresolved which one will be right.

The medical debt ad at the center of the race

A 30-second ad for Hamilton's campaign, viewed more than a million times on X according to Yahoo News, features Meischa Zimmerman, a former Marshall patient. Zimmerman says she was arrested eight months pregnant over an unpaid $50 medical bill and asked not to be handcuffed in front of her two-year-old daughter. She's one of roughly 700 patients Marshall sued for medical debt, reporting that traces to The New York Times's Sarah Kliff. Those lawsuits resulted in 81 arrests.

Marshall's legal team disputes the ad's core number. In a September 28 letter demanding the ad be pulled, cited by Yahoo News, Marshall's lawyers say the actual collection action sought $3,595, not $50, and that the $50 figure doesn't appear anywhere in the case file as a basis for any arrest. They've accused the Hamilton campaign of defamation.

Marshall, for his part, defended the billing practice during a debate at the Kansas State Fair last month, calling it "common, common business practices" and saying his office would wait a year before sending an account to collections. That answer drew chants of "Shame on you" from the crowd, according to Yahoo News. Kliff said on X that patients she interviewed described being sued sooner than a year. Marshall separately has called the ad a "lie."

That's a genuine factual dispute between two named parties, Marshall's legal team and the ad's subject, over how fast and for how much Marshall's practice pursued patients. Neither side's version has been resolved in court yet.

The bigger map

Democrats control 47 Senate seats to Republicans' 53, according to The Washington Post, and would need to flip four GOP seats while holding all their own to win a majority outright. A 50-50 split would still leave Republicans functionally in charge because Vice President JD Vance holds the tie-breaking vote.

Beyond Kansas, New York Times/Siena polling cited by Wonderwall shows Democrat Mary Peltola leading Republican Sen. Dan Sullivan 50-43 in Alaska, Democrat James Talarico leading Republican Ken Paxton 51-45 in Texas, and former Sen. Sherrod Brown leading Republican Sen. Jon Husted 49-46 in Ohio. All three states went for Trump by double digits in 2024. North Carolina remains the seat Democrats are most favored to flip, with former Gov. Roy Cooper up 11 points over Michael Whatley in an Elon University/YouGov poll. Republican outside group Senate Leadership Fund has paused its ad campaign there and cut more than $15 million in remaining ad bookings, per AdImpact data cited by CNN.

Trump's approval sits at 34 percent in CNN's Poll of Polls, amid what CNN describes as voter frustration over the economy and the administration's military action against Iran. Republicans are still outspending Democrats on advertising in eight of the 10 most competitive Senate races from October through Election Day, according to AdImpact, though CNN notes that edge is partly offset by GOP-aligned outside groups paying more per ratings point than Democratic campaigns.

Columbia political scientist Robert Y. Shapiro told Newsweek that a Kansas flip is plausible "if this is a 'Wave' election," or simply because Hamilton is "a very good moderate Democrat running against a very vulnerable opponent." Whether that's a one-off or a new precedent for Kansas Democrats, he said, depends on what happens after November.

The defamation dispute over Marshall's collections ad hasn't gone to court. Whether Hamilton's campaign pulls or keeps running it, and whether Marshall follows through on a lawsuit, remains an open question with four weeks left before Kansas voters decide whether to end a 94-to-107-year streak.