Chicago mothers killed on corner where they stood for peace

Every day, guns are used to kill roughly 100 Americans and injure hundreds more. Chicago has been a particular locus of gun violence; this past weekend, 48 people were shot there -- eight fatally. Among the dead were two young mothers supporting a community organization that strives to stop violence. John Yang talks to Tamar Manasseh of Mothers/Men Against Senseless Killings.