CNN anchor Jake Tapper repeatedly asked Donald Trump on Sunday to denounce David Duke's support for his candidacy, but Trump insisted he didn't know anything about about the former KKK grand wizard. "Will you unequivocally condemn David Duke and say that you don't want his vote and that of other white supremacists in this election?" Tapper asked Trump on "State of the Union." But Trump, the Republican presidential frontrunner, said he didn't have enough information to answer the question: I don't know anything about David Duke, OK? I don't know anything about what you're even talking about with white supremacy...