He walked north through the dust on the shoulder of George Washington Boulevard, along the edge of the great cemetery on his left, through Lady Bird Johnson Park, and across the Arlington Memorial Bridge. Then he walked clockwise around the Lincoln Memorial, past the Vietnam Wall, and turned right along Constitution Avenue, the reflecting pool on his right, the Washington Monument up ahead. He walked past the National Museum of American History, past the National Museum of Natural History, and turned left onto 9th Street. Exactly three and a half miles, on a glorious morning, an hour's brisk walk through one of the world's great capital cities, past landmarks the world's tourists flock to photograph, and he saw absolutely nothing at all except the dull mist of worry hanging just in front o
