So, what was Barack Obama up to when he ran former Weather Underground bomber Bill Ayers' "education reform" foundation? Not much good - at least according to the guy in charge of Chicago's public schools while he was there. "There was a total lack of accountability" at Obama and Ayers' Chicago Annenberg Challenge, former city school superintendent Paul Vallas has told The Post. Indeed, "If you went back and asked, you'd be hard-pressed to find out how the money was spent." Well, maybe. As it turns out, the Obama-helmed CAC was directing big bucks toward the propagation - in Chicago...