Cindy Sheehan, the so-called "Peace Mom" who gained national attention protesting President Bush's Iraq war policy by remaining camped in a ditch near his Crawford, Texas, ranch, has issued a resignation letter as the face of the American anti-war movement. "Good-bye America," Sheehan writes in her online diary, "you are not the country that I love and I finally realized no matter how much I sacrifice, I can't make you be that country unless you want it." Sheehan says she came to her "heartbreaking conclusions" this Memorial Day morning, saying, "These are not spur of the moment reflections, but things...