Plot: 2011/12/07 Headlines: Obama Takes on GOP Economic Platform in Fiery Speech; Occupy Wall Street Activists Take Over Foreclosed Homes; Activists Hold Sit-Ins to Challenge Corporate Influence on Capitol Hill; Occupy Encampments Cleared in New Orleans, Hartford; Mine Owner to Pay $209 Million for West Virginia Disaster; 19 Killed in Afghan Roadside Bombing; U. S