It's an insoluble dilemma, really. Presidents change, different men with different temperaments and appetites sit in the Oval Office. However, a long-range intelligence strategy doesn't change, not one like this. Yet an offhand remark over a glass of whiskey in a postpresidential conversation, or an egotistical phrase in a memoir, can blow that same strategy right to hell. There isn't a day that we don't worry about those men who have survived the White House.