2012/12/19 Headlines: Biden to Head Gun Violence Task Force; Obama Backs Assault Weapons Ban; 6 More Funerals to Be Held in Newtown; Michigan Governor Vetoes Concealed Weapons Bill; 4 Killed in Colorado Murder Suicide; Lawmakers Strip Indefinite Detention Ban from NDAA; UBS to Pay $1.5 Billion Fine for Libor Rigging; 9 Polio Workers Assassinated in Pakistan; U.S. "Deeply Disappointed" in Israeli Settlement Expansion, Yet Won't Take Action; NBC News Crew Freed from Captivity in Syria