special guest at graduation. president obama will give the commencement speech. the nato conference in chicago ground zero for diplomacy and protests. a fierce confrontation yesterday between protesters and police left dozens of people injured on both sides. today more demonstrations are planned. our ted rowlands has been basically in the thick of all of that. protesters, ted, vowing to shut down, i understand, boeing s chicago headquarters today. what is happening now? is it fairly peaceful here? have they managed to shut down anything? they re just finishing a march, suzanne, arriving at boeing headquarters, and there s a couple hundred people there, so at this point it s been very peaceful. they have just been marching through the streets of chicago, but we ll see what happens in the next hour or two as they entrench themselves at boeing. we ve been hearing some reports that they are possibly shutting down some streets. if they do that, police may be forced to go in an