Reacting to yet another slur aimed at Vice President Kamala Harris by Donald Trump, this time at a Turning Point USA speech on Friday night, a former GOP campaign strategist rained hell on the former president whom she labled “mediocre” at best. During an appearance on MSNBC’s “The Weekend,” Tara Setmayer, a fierce Trump critic, blasted the ex-president for calling Harris a “bum” and detailed a substantial number of Trump foibles that make him the actual “bum.” After watching Trump saying of his opponent in November, “She was a bum three weeks ago. She was a bum, a failed vice president,” Setm…