Mid-decade redistricting battle could reshape House control in November

Congressional maps are being rewritten for millions of Americans just months before the November midterm elections, turning redistricting into an immediate voter-navigation problem and a fight over House control. States usually redraw congressional districts once a decade after the census, but eight have already adopted new House maps this cycle, a pace the National Conference of State Legislatures says has not been seen since the 1800s.

The political math is stark. Republicans believe the new maps could help them gain as many as 13 House seats across Texas, Florida, Missouri, North Carolina and Ohio. Democrats think they could gain up to 10 seats from new districts in California, Utah and Virginia, though those projections depend on voting patterns holding in November. In Texas, Harvard Kennedy School’s Benjamin Schneer said the redraw was unusual and that the explicit goal was to add five Republican seats. That push began after President Donald Trump urged Texas Republicans to redraw their U.S. House lines, and Democrats answered with their own map changes in California.

The latest round of mapmaking has also played out in courtrooms, where election calendars are being forced to reset. On April 29, 2026, the U.S. Supreme Court’s ruling in Louisiana v. Callais struck down a Louisiana district drawn with a Black majority of constituents, a decision widely seen as weakening a key Voting Rights Act protection. Louisiana then suspended its May 16 primary so lawmakers could redraw the map. In Alabama, Republicans enacted a law on May 9 to ignore the results of the May 19 congressional primaries and hold a new election if federal courts lifted an order requiring a second majority-Black or near-majority-Black district. The Supreme Court granted Alabama’s request two days later to dissolve that injunction, and Gov. Kay Ivey later set special primary elections for Aug. 11 in affected districts.

Virginia’s fight ended differently. On May 9, the Virginia Supreme Court struck down a Democratic-backed redistricting plan on procedural grounds and left the state’s previous maps in place for the 2026 elections. That rejected map had been designed to give Democrats 10 of Virginia’s 11 House seats, up from the six they currently hold.

The stakes reach beyond state lines. Democrats need only a few seats to retake the House majority, and the president’s party typically loses ground in midterm elections. With lawmakers in several states still weighing new maps or litigation-backed changes, the redistricting battle remains a live contest over who votes where, which party starts with the advantage, and how the 2026 ballot will look in districts that are still being redrawn.