Kansas hasn't elected a Democrat to the U.S. Senate in roughly a century. Four days before Tuesday's midterms, that streak is suddenly in real jeopardy.

Republican Sen. Roger Marshall is locked in an unexpectedly tight race against Democrat Adam Hamilton, a United Methodist pastor, with at least one late-September poll from YouGov showing Hamilton ahead by three points in a state Republicans have treated as safe for a generation. Analysts tracking the battle for Senate control now list Kansas among the handful of races that could tip the chamber either way.

At the center of the fight: farmers. Kansas' agricultural economy has been squeezed for months by high fuel and fertilizer costs that farm groups tie partly to the fallout from this year's Iran war, on top of the effects of the administration's tariffs. The two candidates clashed over exactly who's to blame at their final debate, with Hamilton's campaign running ads highlighting struggling farm families and Marshall defending the administration's broader economic record while touting his own record on bonus depreciation, estate-tax exemptions, crop insurance and clean-fuel tax credits for corn and soy growers.

Marshall has President Trump's endorsement and has leaned on his background as a physician and longtime advocate for rural health care and agriculture policy. Hamilton, meanwhile, has picked up support from an unlikely corner: former Republican Govs. Bill Graves and Mike Hayden have both backed him, arguing the state needs a senator focused on lowering costs for farm families over party loyalty. Hamilton has also out-raised Marshall in the most recent fundraising period, part of what's expected to be a race topping $50 million in total spending — enormous by Kansas standards.

Not every rural constituency breaks the same way. Cattle ranchers, who've chafed at the administration's beef import policies, represent a wildcard bloc that could cut against Marshall even among otherwise reliable Republican voters. A Libertarian candidate, David Graham, is also on the ballot and could siphon off a small but potentially decisive share of the vote in a race this close.

National Democrats have increasingly treated Kansas as a real pickup opportunity rather than a longshot, pouring in late resources as part of a broader midterm push across traditionally red territory. Republican strategists, for their part, say they still expect the state's underlying partisan lean to hold on Election Day — but acknowledge they're not taking anything for granted in a race this unexpectedly competitive.

What's next: both campaigns are making their final pushes across the state through the weekend, with early voting already underway ahead of Tuesday's polls.