Cindy Sheehan from California became an antiwar campaigner following the death of her son Casey, while he was serving in the U.S. Army in the Middle East. She was among the strongest and most persistent voices against the Iraq War. She is known as "Peace Mom," not only because it's the name of her book, but also because her story points the way to a future of world peace, serving as a clarion call to all those who wonder if one person can make a difference.