Overview: 2013/02/18 Headlines: Tens of Thousands Rally in D.C. Against Keystone Pipeline; Admin Has Backup Plan on Immigration; Obama Talks Gun Violence in Chicago; Sister of Audience Member Slain Hours Later; Shiites Urge Protections After 85 Killed in Pakistan Bombing; Karzai Bans Forces from Calling in NATO Strikes; 37 Killed in Iraq Bombings; Bahrain Protests Continue After Uprising's 2nd Anniversary; Palestinians Stage Rallies for Hunger-Striking Prisoners; Correa Wins Re-election in Ecuador; Chávez Returns to Venezuela After 2-Month Absence; Thousands Rally in Maldives for Ousted President Nasheed; Washington St. Nuclear Site Leaking Radioactive Waste; Jesse Jackson Jr. Admits to Misusing Campaign Funds; Sen. Menendez Faces Probe of Donor Ties; NYC Bus Drivers End Month-Long Strike