THE BEST THING HILLARY RODHAM CLINTON could do for humanity is not run for president. Nothing against her personally, mind you; it's just that her aspirations could get in the way of her husband's worthier ones. In our continuing quest to find an appropriate job for our favorite ex-president — a year and a half ago we suggested he become chairman of the Democratic Party — we now offer an even better suggestion. This time, it's a post he has coveted. Not long after leaving office in 2001, Clinton reportedly told an aide that his dream job would be secretary-general...