Larry Hogan will be introducing his running mate Wednesday night in his bid for the Republican nomination for governor of Maryland.The Republican founder of Change Maryland plans to make the announcement at a rally scheduled at Mike's Crabhouse in Riva at 7 p.m.Hogan, of Edgewater, officially became a candidate in the GOP race last week. But he plans on making his official announcement at Wednesday's event.Hogan served as the appointments secretary in former Gov. Robert Ehrlich's cabinet from 2003 to 2007.He is running against Harford County Executive David Craig, Del. Ron George, R-Arnold, and Charles County businessman Charles Lollar for the GOP nomination. The primary election will be held June 24.