It’s your Uncle Sam, and this is the great American game!” The stakes of the Super Bowl halftime show have never been higher. As Kendrick Lamar appears crouched in a spotlight on the hood of a classic GNX car beneath the crab-like eyes of Donald J Trump – the first sitting president ever to attend a Super Bowl – he seems impishly intent on using the biggest moment of his career so far to charm and disarm the cruel world order.