Hang on to your hats, New Yorkers. That’s the word in the wake of this week’s decision of the United States Supreme Court to take a new look at the meaning of the constitutional mantra of “one man, one vote.” It could ignite an earthquake in American politics.

The case — known as Evenwel v. Abbott — is arising from Texas. It’s about whether voting power has to be apportioned equally by general population or by eligible voters. The impact could extend way beyond the Lone Star State, shifting political power away from cities.