A Year After the Virginia Tech Massacre, Debate Continues over Gun Control

It's been one year since the massacre at Virginia Tech, where surviving students -- including some of the wounded -- are pushing for gun control. But students elsewhere want the right to carry concealed weapons on campus for self-defense, and that's been legalized in a few places. In the past year, some 30 incidents on school campuses have killed 14 people and led to proposed restrictions in 38 states.  We hear from students on both sides, as well as how urban and rural communities are locked in ongoing struggles over public safety and the right to bear arms.