How to ban gerrymandering when the Supreme Court is stacked against you

American elections aren’t what they used to be: Thanks to relentless, politically driven gerrymandering, fewer and fewer congressional seats are truly competitive. Millions of Americans are locked into districts where their vote will never elect the party of their choice. But gerrymandering is also notoriously hard to fix. Many sitting lawmakers owe their seats to districts that have been wildly contorted to create secure seats. So asking legislators to ban gerrymandering often means asking them to endanger their own jobs. Nevertheless, the stars may soon align for opponents of partisan electoral maps. Last time Democrats controlled the US House, they passed a bill that sought to eliminate gerrymandering. That bill died in the Senate. But, if the polls are correct, Democrats are poised to take both houses of Congress in November. If President Donald Trump remains an albatross around Republicans’ necks through 2028, Democrats could soon control both elected branches of government. That’s good news for opponents of gerrymandered maps, because, as recent developments show, any viable solution to congressional gerrymandering will have to come from Congress and not the states. Some blue states, such as California and Virginia, had previously enacted constitutional amendments intended to halt gerrymandering in those states. But Democrats...