Far be it from us to coach the president of the United Auto Workers on how to run his union. What, though, would Walter Reuther and his brothers have made of Shawn Fain’s truculence in announcing that a president of the United States, albeit one who’s out of office, is not welcome on the picket line? Never mind that the out-of-office president is far and away the leader for the Republican nomination for president in 2024.