Republican Rep. Zach Nunn and Democratic challenger Sarah Trone Garriott will compete in Iowa's 3rd Congressional District. The primaries held on June 2, 2026, set the stage for two Republican-held battleground House races in Iowa, which are expected to influence the control of Congress in the upcoming fall elections. Democratic former state Rep. Christina Bohannan will again face GOP Rep. Mariannette Miller-Meeks in the southeastern part of Iowa, following a close election in 2024. Both Nunn and Garriott were unopposed in their primaries. In the 2nd District, left open by Republican Rep. Ashley Hinson's Senate bid, former state Rep. Joe Mitchell, endorsed by former President Donald Trump, is projected to win the Republican nomination, while state Rep. Lindsay James is expected to be the Democratic nominee.
In California, four significant battleground House races are anticipated due to redistricting. In the 22nd District, Rep. David Valadao, the only Republican House member who voted to impeach Trump in 2021, is running without Republican challengers. The competition for the second general election spot is between two Democrats: state Assemblymember Jasmeet Baines and local school board member Randy Villegas. The 48th District features a similar dynamic with two Democrats vying for a chance against a Republican. Redistricting has shifted the 13th District into a competitive race, targeting Democratic Rep. Adam Gray, while the 6th District sees newly independent Rep. Kevin Kiley facing a crowded Democratic field. The 1st District has two former state legislative leaders as frontrunners for the general election.
Additional battleground races include New Jersey’s 9th District, where Democratic Rep. Nellie Pou seeks re-election in a district narrowly won by Trump in 2024, and Montana’s 1st District, which will be open due to the retirement of Republican Rep. Ryan Zinke. Both parties are experiencing crowded primaries in these districts.
