Overview: Headlines for April 05, 2016; Panama Papers: World Leaders from Iceland to Argentina Exposed in Massive Tax Evasion Scheme; Did Bernie Sanders Predict the Panama Papers When He Opposed Clinton-Backed U.S.-Panama Trade Deal; Panama Papers' Reporters Explain How the Biggest Leak in Data Journalism's History Materialized; Could Citizens United Help Foreign Billionaires Buy This Election An FEC Commissioner Speaks Out