2013/03/21 Headlines: Obama, Netanyahu Stress Shared Stance on Iran; Obama Affirms "Unbreakable Bond" with Israel, Vows Aid; Palestinians Erect Tent Camp Ahead of Obama Visit; Syria, Rebels Ask U.N. for Chemical Weapons Probe; Karzai Backs Down on U.S. Special Forces Ban; North Korea Threatens U.S. Bases in Japan After B-52 Flight; Colorado Governor Signs Gun Control Law; Head of Colorado Prisons Shot Dead at Home; Gitmo General Acknowledges Growing Hunger Strike; U.S. Unveils Charges Against Saudi-Nigerian Terror Suspect; N.C.