Off-cycle gerrymandering has stood out as the biggest and most controversial strategy so far for picking up House seats in this high-stakes midterm year. President Donald Trump got the ball rolling last year by having the expansive red state of Texas create a district map intended to snatch a handful of its 38 seats away from Democrats.

The GOP move in Texas and elsewhere brought efforts at retaliation from blue states. California, with 52 seats, also manipulated its map in a way that could yield Democrats five seats. New York was among those that got in the fray with an 11th-hour bid to chop up and flip the district of Staten Island Republican Rep. Nicole Malliotakis. But on Monday, the U.S. Supreme Court ruled 6-3 against letting New York do this for November.

Texas held its statewide primaries Tuesday. The results raise questions about whether the Lone Star gerrymander will help the GOP keep its House........

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