Watergate's Clearest Lesson

Ten years later, the point remains: Not even a President is above the law

A few weeks ago, a handful of survivors of the Titanic came together in a Philadelphia hotel to observe the 70th anniversary of the sinking. They fetched out their memories of that night and passed them around like photographs. They gazed at a few forlorn relics of the voyage: Mrs. John Jacob Astor's life jacket, a battered deck chair, other odds and ends from the unsinkable "Floating Palace" before it went down.

It will be ten years next week since a security...