Plot: 2010/12/20 Headlines: S. Korea Conducts Live-Fire Military Drill; Senate Strikes Down "Don't Ask, Don't Tell" Policy; Senate GOP Blocks DREAM Act; Local Community Radio Act Passes in Senate; Senate to Vote on 9/11 Health Bill and START Treaty; VP Biden: Assange is a "High-Tech Terrorist"; Assange: Chief Concern is Threat of Extradition to U