White men dominated campaign staffs for presidential candidates in 1988 when Jonathan Metcalf, a black man, got his first job in politics with the Rev. Jesse Jackson, who made a serious bid for the White House. That is no longer the case for Democrats in South Carolina. Metcalf joined political directors for seven other campaigns during a panel discussion at the Greenville Convention Center in December, and each of the panelists was black. They're part of an evolving strategy to tap into the most important voting block in the state's presidential primary.