He may be the most effective presidential Middle East envoy in decades, but he doesn’t get much respect from the press. It is hardly an understatement to say that Jared Kushner, a baby-faced real-estate magnate and presidential son-in-law, didn’t send expectations soaring when he was named to supervise Israel-Palestine peace efforts. Lacking years of diplomatic experience and advanced degrees in Near Eastern politics, his appointment seemed more like favoritism than a confirmation of expertise, more a presidential gift to his daughter than a strategic decision. What little coverage Kushner has received has varied from skeptical to scornful. And, tellingly, he...