Kansas Senate race spending tops $84.5 million, setting state record

Ad spending for the Kansas U.S. Senate race has surpassed $84.5 million, establishing the most expensive election in the state's history. The total eclipses the previous record of $49.1 million set in 2020 when U.S. Sen. Roger Marshall first ran for office. According to AdImpact, an ad tracking company, the current campaign has generated a spending surge that far outpaces recent state contests.

The race pits incumbent Marshall against Democratic pastor Adam Hamilton and Libertarian candidate David Graham in the Tuesday election. National attention has focused on the contest as major parties vie for Senate control. The 2026 cycle is also tracking as the most expensive nationwide on record. Since the August primary, both major candidates have pursued aggressive campaign strategies to define the contest.

Marshall's campaign targeted Hamilton's past sermons and a child sex abuse incident at the church's youth camp twenty years ago. Hamilton countered by criticizing Marshall's ties to Florida and his history of medical debt collection practices while serving as an OB-GYN in central Kansas. These exchanges have dominated the airwaves leading up to the general election.

Federal campaign finance records as of October 14 show a stark difference in direct campaign spending. Hamilton's campaign has outspent Marshall by a wide margin, with more than $16 million spent this season. Marshall's campaign spent just over $6 million during the same period. This disparity highlights the reliance on external financial support for the incumbent's bid.

Outside groups account for the majority of total spending in the race. Expenditures have risen by 3,332% compared to the 2022 Kansas Senate election, according to AdImpact. Pro-Marshall groups have spent more than $27 million, with at least $8.5 million more in ads scheduled for release. Pro-Hamilton groups have spent more than $34 million, with another $14 million expected to be deployed before election day.

The Senate Leadership Fund has been the largest spender for Marshall, investing at least $11 million in the state after redirecting funds from North Carolina earlier this month. The group has aired ads supporting Marshall and opposing Hamilton. On the other side, the People over Politics Action Fund, a Kansas-based super PAC with ties to former independent candidate Greg Orman, has spent more than $11 million against Marshall. Orman contributed $50,000 to the PAC in July.

National super PACs have also heavily invested in the contest. Lower Costs Now, a Democratic super PAC, has spent nearly $6 million against Marshall and $4.5 million for Hamilton. Main Street Fund, a Republican-affiliated super PAC formed on primary day, has spent nearly $4.6 million against Hamilton as of October 21. The latter group drew funding from other Republican-aligned and pro-Trump PACs.