According to SF Gate, filmmaker Richard Linklater has waded into the tight U.S. Senate race in Texas with a social media ad questioning Republican Sen. Ted Cruz's toughness. The "School of Rock" and "Dazed and Confused" director made a 30-second spot for a political action committee backed by Cruz opponents. The ad does not endorse or even mention Cruz's opponent, Democratic Congressman Beto O'Rourke.