Almost since the start of Barack Obama’s presidency, people who have actual, real duties in the West Wing of the White House—the working, executive part of the government, that is—have been urging him to do something about Valerie Jarrett. Push her into the East Wing, where she can hang out with Michelle Obama and the White House social secretary, or give her an ambassadorship—or something—but for Pete’s sake get her out of the way of the hard work of governing that needs to be done. Now it’s really time to do it. Let’s stipulate right away that it would be...