Wisconsin voters are casting ballots Tuesday in a series of House primaries that could set the stage for key battleground races in November. Polls close at 9 p.m. EDT, and results will be tracked live by Decision Desk HQ.
The most closely watched contest is in the 3rd Congressional District, where Democrat Rebecca Cooke is seeking her party's nomination for a second consecutive run against Republican Rep. Derrick van Orden. Cooke, who narrowly lost to van Orden in 2024, faces a challenge from her left in the primary. The district, which covers western Wisconsin, is considered a toss-up and is a top target for Democrats hoping to flip the seat.
Cooke's challenger, who has not been named in initial reports, is positioning herself as a more progressive alternative. The primary will test whether the party's base is satisfied with Cooke's centrist approach or is hungry for a more left-wing standard-bearer. This dynamic mirrors broader questions about the progressive movement's strength in the Midwest, as highlighted in recent analysis of regional primaries.
Meanwhile, in the 7th Congressional District, Republican Rep. Tom Tiffany is vacating his seat to run for governor, creating an open race in a solidly red area. President Trump has thrown his support behind Michael Alfonso, the son-in-law of former Transportation Secretary Sean Duffy. Alfonso is competing in a crowded GOP primary, with the winner expected to easily secure the seat in November.
The Wisconsin primaries are part of a broader slate of contests across several states, including Minnesota and South Carolina, that are shaping the 2026 midterm landscape. Political observers are watching these races for signals about voter enthusiasm and the effectiveness of endorsements from high-profile figures like Trump and progressive leaders such as Sen. Bernie Sanders, who has notably declined to endorse in the Wisconsin governor's race.
For Democrats, the 3rd District primary is a bellwether. Cooke's campaign has emphasized her rural roots and ability to appeal to working-class voters, while her opponent argues that a more aggressive progressive platform is needed to turn out the base. The outcome could influence how the party approaches other competitive races across the country.
In the 7th District, Alfonso's bid has drawn national attention due to his family ties and Trump's backing. His opponents are trying to paint him as an establishment pick, but the district's conservative lean makes the GOP primary the decisive contest. The winner will likely face minimal Democratic opposition in the general election.
As results come in, attention will also turn to other primaries happening simultaneously, including those in Minnesota and South Carolina, which are part of the same live tracking effort by Decision Desk HQ and The Hill. These races will provide early indicators of voter sentiment ahead of the midterms.
The Wisconsin primaries come at a time when control of the House is up for grabs, with both parties eyeing every competitive seat. The 3rd District, in particular, is seen as a must-win for Democrats if they hope to regain the majority. National groups are already pouring resources into the race, and Tuesday's primary will determine who carries the Democratic banner into the fall.
With polls now closed, all eyes are on the returns. The results will not only settle the primary contests but also set the narrative for the general election battles to come.
