12/26: Killer holiday storm on the move; Success at annual "gun buyback"

      |The Midwest got a blizzard for Christmas, the South got dozens of tornadoes, and now a killer storm sets its sights on the Northeast. Troy Kehoe reports from Bloomington, Indiana; Also, because of the shooting in Newtown, Conn., L.A. Mayor Antonio Villaraigosa moved up the annual "gun buyback" usually held in May. People waited in line up to 3 hours to turn in their guns; And, new evidence shows a link between the nationwide shortage of cancer medicine and declining rates of recovery from childhood lymphoma.

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