For years, Rupert Murdoch seemed content to let his children battle it out for control of his conservative media empire once he’s gone.Jim Rutenberg, who writes about media and politics for The Times, discusses how a secret change to that plan by Mr. Murdoch touched off an ugly family squabble that could influence how much of the world sees the news. Guest: Jim Rutenberg, a writer at large for The New York Times and The New York Times Magazine.