2024 is looking to be the year America’s most durable political alliances come unglued.

The Trump era is driving a deep rethink of what makes a Democrat and what makes a Republican. Now that once-in-a-generation ideological debate is playing out in ways pundits could hardly have predicted even a few years ago.

We’ve already seen the aftershocks of America’s political realignment on the abortion debate, where decades of political skittishness on Democrats’ part have given way to a robust pro-choice message personally amplified by President Biden. Now Republicans’ stunning collapse in the face of a bipartisan border deal puts Democrats in the unique position of running to the GOP’s right on immigration and border security.

The party’s cowardice on the border offers Democrats a rare opportunity to redefine an issue that has favored Republicans for much of the past 40 years. Sharp political players including Sen. John Fetterman and Biden have been quick to seize the opportunity, even as Democrats’ newfound love of border policy risks inflaming the party’s restive left.

This week’s latest example of GOP legislative dysfunction comes more than a decade after an extreme Republican House of Representatives tanked........

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