Three super PACs have spent more than $600 million combined on the 2026 Senate battlefield, and most of it is going to the same handful of races: Ohio, Michigan, Iowa and North Carolina. ​

Senate Leadership Fund, the main Republican Senate super PAC, has spent the most, at $252.3 million. Nearly all of it pays for attacks on Democrats. Its biggest target by far is Sherrod Brown in Ohio, at $68 million. It has also spent $36.5 million against Abdul El-Sayed in Michigan, $34.3 million against Joshua Turek in Iowa and $30.2 million against Roy Cooper in North Carolina. By comparison, it has spent less than $2 million each promoting its own candidates, Jon Husted in Ohio and Mike Rogers in Michigan. Its weekly spending held steady at about $38 million.

No Going Back PAC, another Republican group, is second at $191.7 million. It has spent $24.5 million against El-Sayed, $20.2 million against Brown and $8.9 million against Cooper. It puts more into positive ads than Senate Leadership Fund does, with $7.6 million backing Husted and $5.3 million backing Rogers. In all, it has supported 63 candidates. It spent $30 million last week, down slightly from $31.4 million the week before.

WinSenate, the Democrats’ answer, is third at $170.7 million. It mirrors the Republican approach by going on offense: $44.8 million against Husted in Ohio, $28.2 million against Ashley Hinson in Iowa and $22.3 million against Rogers in Michigan. Its largest positive investments are $7 million for El-Sayed and $5.4 million for Troy Jackson in Maine. WinSenate is also the only one of the three that is accelerating. Its weekly spending rose to $33.4 million from $28.2 million.

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