Values show the Democratic gain needed in every district to reach 218 seats. Alabama's attempted redistricting remains on appeal. Data: Axios analysis of data from The Downballot, MIT Election Lab and Dave's Redistricting App; Chart: Andrew Pantazi/Axios

Republican-led states have redrawn enough congressional districts to force Democrats to outperform their 2024 national results by nearly 5 percentage points if they want to retake the majority in the 2026 midterms.

Why it matters: Control of the House will shape whether President Trump will be allowed to govern largely unchecked during his final two years, or left facing a chamber armed with subpoenas and oversight.

Democrats need to flip three seats to win the House, assuming vacancies return to the parties that last held them.

State of play: Before the redistricting push, Democrats needed to outrun Kamala Harris' 2024 margins by 3.1 points to win a House majority. Now they need to run 4.9 points ahead.

Put another way, the new maps are worth nearly 2 extra points to Republicans in the national margin, an Axios analysis of district-level data found.
Democrats have an almost 6-point advantage over Republicans on the generic congressional ballot as of June 7, according to polling aggregator FiftyPlusOne.

Catch up quick: Trump started the mid-decade redistricting war by pushing Texas to redraw early, then widened it nationally to protect Republican control of the House.

The Supreme Court's Louisiana v. Callais ruling in April accelerated that by making partisan goals a stronger shield for states accused of weakening Black voters' power.
That opened the door for Louisiana, Alabama and Tennessee to target districts where Black voters elected their preferred candidates. Florida had moved preemptively.
Democrats thought they had blunted the GOP gains by persuading voters to approve major redraws in California and Virginia, but Virginia's result was overturned by the state's Supreme Court.

By the numbers: Harris carried 205 House districts before redistricting but would win just 200 under the new maps. Democrats need 218 to win a majority.

Trump beat Harris by 1.5 points nationally. She needed a roughly 3.4-point national margin to carry a majority of districts.
Across the 10 states that redistricted, Democrats held 80 seats in 2024 to Republicans' 101. Just to hold that ground, Democrats would need to outrun Harris' margin by 10.5 points.

Yes, but: The pro-Republican tilt is real, but not historically extreme.

Harvard Law professor Nicholas Stephanopoulos tells Axios the current GOP skew is "not remotely as bad" as the post-2010 maps, when Republicans' aggressive gerrymanders met few Democratic offsets.
In 2012, Democrats needed about a 5.6-point national win to control the House. The median district backed Romney by 1.7 points even as Obama won nationally by 3.9.

Between the lines: The maps could thin Congress' moderates.

Four of the 13 Democrats who won Trump-carried districts in 2024 face electorates that are now more GOP-leaning: North Carolina Rep. Don Davis, Ohio Rep. Marcy Kaptur and Texas Reps. Henry Cuellar and Vicente Gonzalez.
California shifted two Democrats who won Trump districts into more Democratic terrain.

The fallout: Incumbents caught in the new lines face three choices.

Retire: Tennessee Rep. Steve Cohen (D) walked away rather than fight on hostile ground. Tennessee lawmakers cut the Black share of voting-age residents in Cohen's Memphis district from 60.3% to 31.7%.
Change districts: Florida Rep. Debbie Wasserman Schultz (D) is running in a Black-plurality district that shares just 2.1% of her old seat's population, the smallest incumbent overlap in Axios' analysis.
Stay and fight: Louisiana Rep. Cleo Fields (D), who won a new Black-majority district in 2024, will face an electorate that backed Trump by 32 points.

The latest: The U.S. Supreme Court granted Alabama's petition to let it use a 2023 map that a lower court ruled intentionally discriminated against Black voters.

In Florida, a judge declined to block the state's new map, ruling there wasn't enough proof it was drawn with partisan intent in violation of state law.

What's next: The tilt may not cost Democrats the House in 2026 if their polling lead holds. But it could shrink their margin.

"Majority control matters," Stephanopoulos tells Axios, "but the size of the majority matters as well."
The bigger risk is 2028. In a tighter year, he says, the built-in GOP edge means a narrow Democratic popular-vote win "would almost certainly cost them the House."

The bottom line: Candidate quality, turnout, money, scandals and the national mood still decide races, but pro-GOP redistricting gives Republicans a head start.