When a leader confidently ceases strolling on the water and people are staring in awe at their otherworldly success, they often turn stupid for a while. Pundits have mused that if President Lincoln had not been assassinated, he would have been impeached for his efforts at reconstruction, even though he had recently ended civil war and slavery. President George W. Bush was extremely successful in the 9/11 aftermath, but became a subsequent travesty of leadership during his second term in...