Michele Naar-Obed knows she will not stop the war in Iraq by walking the streets of Baghdad, unarmed and unguarded, calling for an end to the violence, but she considers it her duty to try. She is 49 years old, a mother, a wife, a pacifist who can't stand to be passive. Soldiers put their lives on the line for their country; she will risk hers too, in pursuit of peace. Four of her colleagues in the pacifist movement were kidnapped in Baghdad late last month. The men — fellow members of Christian Peacemaker Teams — have been threatened with...