It was a non-endorsement endorsement by the International Brotherhood of Teamsters tonight. Sean O’Brien proudly proclaimed he was the first president of the labor giant to formally address the Republican National Convention in its 121-year history. The address was an indefatigable screed in defense of America’s workers. It showed a changing of the guard both within the Republican Party, which had long loathed the Teamsters, and the union itself, as O’Brien said he didn’t care if your name has...