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Independent redistricting analysts at the Brennan Center for Justice put the potential national impact higher. In a report released Friday, the center estimated that 70 congressional districts nationally — roughly one in six — contain enough racial-bloc voting that they could be challenged or rewritten under the new standard.

Texas Moves First

Texas, where Governor Greg Abbott called a special session of the legislature within 36 hours of the ruling, is expected to be the first state to actually redraw its map. House Speaker Dustin Burrows announced Friday that the chamber would consider a new map drafted by the State Affairs Committee that would consolidate Houston-area districts currently held by Reps. Sylvia Garcia, Sheila Jackson Lee's successor, and Al Green into two seats — eliminating one Democratic-held seat outright and shifting another into a Republican-leaning configuration.

"Texas is the test case," said Michael Li, senior counsel at the Brennan Center's Democracy Program. "If Texas can do this in May without a court intervening, then by the end of the summer you will see Florida, Ohio, North Carolina and Georgia doing the same. The dam has broken."

Civil Rights Groups Pivot — And Find The Door Closing

Voting rights advocates spent the weekend in emergency strategy meetings. The Legal Defense Fund, the Lawyers' Committee for Civil Rights Under Law, and the ACLU Voting Rights Project announced a joint working group Friday to identify the most legally vulnerable redraws and to challenge them as soon as new maps are introduced.

But the post-Callais legal landscape, several attorneys conceded privately, has narrowed dramatically. Section 5 of the Voting Rights Act — the "preclearance" requirement that historically forced certain Southern states to get federal sign-off before changing voting rules — was effectively neutralized by the Court's 2013 Shelby County v. Holder decision. Section 2, the workhorse of modern voting rights litigation, has now been narrowed by Callais. What remains, advocates say, is largely the federal Constitution's Equal Protection Clause — a slower, more demanding legal vehicle that requires plaintiffs to prove subjective discriminatory intent.

What This Means For The 2028 Map

Election analysts at the Cook Political Report estimated Friday that the Callais decision could shift the partisan baseline of the U.S. House of Representatives by between 8 and 14 seats in the 2028 elections — enough, in either direction, to determine control of the chamber.