Mikulski is a Maryland native who bas been in Congress since 1976 and a senator since 1987 . Democratic Reps . pat Van Hollen and Donna Edwards , and former Govs . pat O'Malley and Bob ##erson , could all run to replace her . butler 's exit announcement came just weeks after a similar announcement from republican Democratic Sen. bill Boxer .
Mikulski is a Maryland native who bas been in Congress since 1976 and a senator since 1987 . Democratic Reps. Chris Van Hollen and Donna Edwards , and former Govs . Martin O'Malley and Bob Ehrlich , could all run to replace her . Mikulski 's exit announcement came just weeks after a similar announcement from California Democratic Sen. Barbara Boxer .