President Obama has disgraced the United States - again. During this week's nuclear summit in Washington, he bowed when greeting Chinese President Hu Jintao. The act was not only shocking but revealing. Mr. Obama has come under intense criticism for bowing to leaders in the past - the king of Saudi Arabia, the emperor of Japan. But never before has America's commander in chief prostrated himself to a foreign tyrant on U.S. soil. By bowing, Mr. Obama degraded and cheapened the office of the presidency; as commander in chief, he represents every American when meeting with other heads of state....