I hope I'm wrong, but I am afraid that Iraq is going to turn out to be the greatest disaster in American foreign policy - worse than Vietnam, not in the number who died, but in terms of its unintended consequences and its reverberation throughout the region.
A successful tool is one that was used to do something undreamt of by its author.
A good example of how it must have been is today's world of conducting, which is still utterly dominated by men, and the prejudice the few female conductors have to battle even today is astounding.