I am flying to Washington, D.C., to join the anti-war march on Oct. 26. This is a considerable commitment of time, money and energy. Why am I doing it? In April 1971, when I was an impulsive, long-haired pacifist of 16, I joined my sister in the Moratorium March on Washington against the Vietnam War with 200,000 others. My youthful idealism was reinforced and sustained as the force of public opinion turned the wheel of history, and the Vietnam war machine ground to a halt. Some of my idealism has survived the ensuing decades. At the same time, I...