The first phalanx of police attacked the marchers at 8 p.m. from the corner of Michigan Avenue and Balbo Street, just north of the Conrad Hilton Hotel, swinging their clubs. The young demonstrators ran in all directions -- into the park, across Balbo, up and down Michigan. Some escaped. Some were caught and beaten. From the window of his campaign head-quarters on the 23rd floor of the hotel, Sen. Eugene McCarthy watched, horrified. "It's incredible," he said. "Like a Brueghel." Classic McCarthy. Detached even in his compassion. And what other American politician, then or ever, would think of scenes from...