Major right-wing donor Bob Mercer is stepping down as co-CEO of his hedge fund and selling his stake in Breitbart

Hedge-fund billionaire and major conservative donor Robert Mercer is stepping down from his position as co-CEO of Renaissance Technologies, he said Thursday. In a letter to employees obtained by Business Insider, Mercer said he had become an object of press scrutiny in the past year, referencing his activity as a major conservative donor. The hedge-fund founder had previously stayed mum about his political beliefs. -- More...