The Hillary Clinton email issue is developing into a real whodunit, complete with Clintonesque legal semantics. "I never sent or received any material marked classified," she said with respect to the discovery of classified information on her private, unclassified email server. That surface denial nearly rivals Bill Clinton's classic: "I did not have sexual relations with that woman." But this is no laughing matter. There is nothing trivial about a secretary of state having top-secret information on an unsecured computer in her home. That appears to have been the case, based on the State Department's announcement last week that 22...