Last night Truth costars Cate Blanchett and Robert Redford sat down for a Times Talk discussion with New York Times Magazine staff writer Susan Dominus, and were later joined by Dan Rather (whom Redford portrays in James Vanderbilt‘s film) and his former 60 Minutes producer Mary Mapes, whose book, “Truth and Duty: The Press, The President and the Privelege of Power,” is the basis of Vanderbilt’s screenplay.