Overview: 2012/01/20 Headlines: GOP Candidates Debate Ahead of South Carolina Primary; Ex-Wife: Gingrich Asked for Open Marriage; Perry Exits GOP Race, Backs Gingrich; Second Officer Backs Trial for Manning; Afghans Protest Deadly NATO Raid; France Suspends Training of Afghan Troops After Shooting; Syrian Protests Follow More Killings; Arab League Extends Monitoring Mission; Top U.S. General Visits Israel for Iran Talks; Iran: Scientist Assassins May Have Used U.N. Info; 5 Moroccans Self-Immolate in Unemployment Protest; U.S. Shuts Down File-Sharing Site, "Anonymous" Hackers Retaliate; Military Suicides Hit New Record High; U.S. Confirms Liberian Leader Worked for CIA; Obama Visits Apollo Theater in New York City Fundraising Trip; 6 Marines Killed in Afghanistan; Vermont Barred from Shuttering Vermont Yankee Nuclear Plant;$