Meet what appears to be one of the keys to Thad CochranÂ’s black-turnout operation, Mitzi Bickers. She is, from all appearances, something of a renaissance woman: She is not only the pastor of AtlantaÂ’s Emmanuel Baptist Church but also a former president of the Atlanta school board, a former construction-company executive, and a Democratic staffer and political strategist with a checkered past. Last year, she left her job as a senior adviser to Atlanta mayor Kasim Reed after news surfaced that she had filed a fraudulent financial-disclosure statement. In a bizarre turn of events, it seems that Bickers was in...