Jurisprudence Photo illustration by Slate. Photos by Win McNamee/Getty Images and Maxine Wallace/Washington Post via Getty Images. Sign up for  Executive Dysfunction , a newsletter that highlights one under-the-radar story each week about how Trump is changing the law—or how the law is pushing back. You’ll also receive updates on the latest from Slate’s Jurisprudence team. After the Supreme Court handed down Louisiana v. Callais last Wednesday, effectively terminating decades of protections for minority voting rights, conservatives across the country cheered at the court’s blessing that they can gerrymander—across both racial and party lines—to their hearts’ content. On Monday, the court allowed that decision to go into immediate effect so that Louisiana can cancel its already-begun primary and rewrite its maps to remove at least one district that had been drawn to allow Black Democrats to vote for their candidate of choice.…