The Democrat-controlled panel investigating Gov. Robert L. Ehrlich Jr.’s hiring and firing practices cannot legally issue subpoenas to identify the mysterious Internet figure known as MD4BUSH, a key request made by Republicans. Assistant Attorney General Robert A. Zarnoch, counsel to the General Assembly, said Thursday that the Special Committee on Employee Rights and Protections does not have the legal authority to subpoena records from a Web site where former Ehrlich aide Joseph F. Steffen Jr. made comments about Baltimore Mayor Martin O’Malley’s marriage. Steffen, an Ehrlich aide, was fired earlier this year after discussing O’Malley (D), who is running for...