DETROIT - When longtime Detroit community advocate Frank McGhee watched two Republican canvassers vote against certifying election results in the majority Black city, he was furious. McGhee, 58, has spent more than two decades working with Detroit youth and educating them on the electoral process. He said it was “outrageous” to see hard-fought Black voter-mobilization efforts threatened. “I thought, these are the ultimate executioners, if you will, put in place so that quietly they could take what belongs to us,” he said. President-elect Joe Biden was in part powered to victory in Michigan, Wisconsin, Pennsylvania and Georgia by Black voters,...