TEHRAN: None of the many Iranian puzzles frustrates America and its allies as much as how to reach Ayatollah Ali Khamenei, the supreme leader who sets the country’s direction. When I asked one veteran Iran hand how old Khamenei is, the answer was “Not old enough.” Years of probing have failed to unearth a conduit to the man with the white beard and outsized glasses whose image, often smiling, dots the billboards of Tehran. The guy’s a mystery. Solving it lies at the heart of the challenge facing President Obama because although Khamenei’s authority is not absolute, his veto power is
