Who outed Valerie Wilson as a CIA secret agent? Clue: her husband, Joseph, had just criticised the Bush administration. Julian Borger talks exclusively to the man who may have started a new Watergate It is early autumn in Washington. The leaves are falling, another election season is limbering up, and the nation's capital is once more embroiled in a gale-force scandal. It is an extraordinary affair that combines espionage, political dirty tricks and weapons of mass destruction - a heady mix normally found only in airport thrillers. But fact has had a knack of trumping fiction in Washington lately. In...