Last week the president spoke out on behalf of the three American hikers who have been held in Iran for nearly a year. During that time, they have been able to make only one telephone call — to their families back in the U.S. — and write no letter at all. Sarah, Shane, and Josh are in Tehran’s infamous Evin prison, and Sarah is locked in solitary confinement save for once a day when she goes to the prison yard and sees the others. “I want to be perfectly clear,” the president said. And then he lapsed into incoherence. “Sarah,...