In Florida, Gov. Ron DeSantis vetoed a map drawn by his fellow Republicans in the Legislature. In Ohio, Republicans closed in on a G.O.P.-friendly map for the midterm elections.
The ruling, in which the judge said Democrats had drawn an “extreme gerrymander,” was the first time this redistricting cycle that the party’s maps had been rejected in court.
The justices sent a case on legislative maps back to a state court for another look, but they refused a request to block the state’s congressional maps.