>> the best news is you're back and we'll get into where liz has been. i'm leland vittert in d.c., outside of our studios, there are teachers and students, political activists gathering in what they call a unified demonstration against gun violence and appears by the signs they're against other things as well. student organizationers hope that will force congress into passing comprehensive gun control and improving school safety. the main rally here in d.c., alison barber, just above that very large crowd you see. alis alison, we get that these folks are against a lot of things, n.r.a. signs and the like. is there one unified message that they're for or they're just angry? >> they're calling for a couple of specific different things that they say federal