TALLAHASSEE, Fla. (AP) — Andrew Gillum, who engineered a surprising upset victory in Florida’s Democratic primary this week, is picking up endorsements, money and plenty of national attention in the aftermath of his win. But as the Tallahassee mayor mounts his bid to become Florida’s first black governor, he is already coming under swift attack from Republican opponents who are trying to use a slow-moving corruption investigation into Tallahassee city government to portray Gillum as untrustworthy.