Jurisprudence Photo illustration by Slate. Photos by Kenny Holston/Pool/Getty Images, Mark Wilson/Getty Images, and SupremeCourt.gov. 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. Over his two decades on the Supreme Court, United States Chief Justice John Roberts had consistently played the long game when it comes to the court’s weakening of voting rights. That was until the past few weeks. With a series of major upheavals in the past month alone, Roberts has signaled that he is shifting to a two-minute offense. This change of velocity, heralded by rulings relating to Louisiana’s and Alabama’s redistricting, threatens to continually upend American elections and create incentives for maximum partisan warfare at exactly the wrong time.…