A woman lost her son in Iraq and won't leave George W. Bush alone until he sees her. Who is she, and why is she stirring such emotion? Cindy Sheehan, 48, is not a natural-born revolutionary. She speaks in a high, almost childlike voice. She says like as often as any teenager, as in, "This whole thing was like so freaking spur of the moment." When her supporters gather to discuss strategy, Sheehan is not to be found in the circle of beach chairs; she is 50 yards up the road, doing yet another interview, hugging yet another stranger....