Roger Marshall

From mid-July to 30 September Marshall raised $618,222, while Hamilton raised $8.27m and finished with more than three times his cash. Cook Political Report moved the race from Lean Republican to Toss Up, and the National Republican Senatorial Committee gave him no party money in September.

The gap never closed. On 3 November Hamilton beat him 50.9% to 46.0%, a Democratic gain on network projections, and CBS News called it at 11:29pm Eastern time. Marshall, who entered the Senate in 2021 after serving in The House, lost a seat his party had held since the 1930s.

With his own campaign short of cash, the fight for Marshall's seat passed to outside committees. WinSenate, the ad-buying Arm of the Democratic-aligned Senate Majority PAC, reported $8.14m of Kansas ads against him from 10 to 20 October, while the Senate Leadership Fund spent $6.29m.

Plains PAC, a committee the fund seeded with $2.7m, made its first filing against Hamilton on 25 October, for $1.59m. Across October, Democratic-aligned groups out-filed Republican ones in Marshall's race by $36.05m to $13.59m. The fund spent $4.91m against Hamilton in the final week. None of it reversed the gap Marshall's own fundraising had left.