With Nikki Haley set to make a last stand of sorts in the South Carolina primary later this month, there’s a hidden reason that Donald Trump has been so dominant throughout the GOP nomination process: White evangelicals. Their support for Trump has held through impeachments, scandals, revelations about sexual assault, multiple serious criminal prosecutions, and even an insurrection attempt. We talked to Sarah Posner, a scholar of the religious right, about Trump’s extraordinary hold on these voters—and why it’s changing the Republican Party in insidious, alarming ways.

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