At some point in the second term of any presidency, the soaring eagle becomes a lame-duck with more quack than quake in its steps. With his place in history assured, President Obama has forged a new healthcare regime, restored relations with Cuba, made unprecedented visits and negotiated a nuclear deal with Iran. The latter of these strains U.S. relations with America's staunchest Middle East allies — Israel and Saudi Arabia — beyond credulity, and suggests the president may be too absorbed in creating his own legacy to think clearly. Obama called the Joint Comprehensive Plan of Action (JCPOA) "the most...