Plot: 2011/09/16 Headlines: Libyan Rebels Attack Gaddafi's Hometown of Sirte; Obama Drops Cuts to Social Security in Debt Reduction Plan; Boehner: Tax Hike "Off the Table"; House Votes to Limit NLRB over Boeing Ruling; Supreme Court Halts Texas Execution of Duane Buck over Racial Bias Claims; Obama Admin Confident of Jailed American Hikers' Release in Iran; U. S