No president in modern times has managed to conceal so much of his biography as this one. The journalists assigned to the Obama beat seem to have lost their traditional avidity for digging out the missing details. We do not have a medical report, or a college transcript from Columbia, or a notion of how well he did in Harvard Law School. These things are not automatically significant, but they can be. Nobody thinks the president has some basic medical problem. He shows every sign of being in excellent physical condition. But so did John F. Kennedy, who turned out...