Thursday marks 100 days since the tragic shooting at Sandy Hook Elementary School in Newtown, Connecticut. President Obama and Vice President Biden will hold an event urging Congress to act on the Senate gun control legislation when it's introduced next month. And New York Mayor Mike Bloomberg's group, Mayors Against Illegal Guns holds a National Day to Demand Action aimed at Congress. We'll talk with Politico's Manu Raju and The Washington Post's David Nakamura.
Plus, NBC National Investigative Correspondent Michael Isikoff has chilling details on the items police found in Newtown shooter Adam Lanza's house and car.