Attorney General William Barr will leave office Wednesday the same way he came in—as a class act. Barr offered a refreshing contrast to President Barack Obama’s former attorney general, Eric Holder, who characterized himself as Obama’s wingman. Barr understands that his first loyalty is to the Constitution and the rule of law, not the president. Attorney General William Barr will leave office Wednesday the same way he came in—as a class act. He carried out his role as the consummate professional who followed the law, administered justice, and forged ahead—despite relentlessly unfair and unjustified criticism leveled at him. Barr offered...