Armed Police marched on the University of Pittsburgh campus after students gathered in hopes of getting a glimpse of Barack Obama at the Phipps Conservatory. There were maybe 20 protesters, and several hundred watching, at first. The police threw tear gas into the crowd, but the crowd reassembled. Later that night the police used serious intimidation techniques, including firing tear gas into crowds, using rubber bullets on students, beating people on the sidewalk with batons, and charging ...