A key House investigating body has dropped its probe of Rep. John Murtha (D., Pa.) and two other members of the House’s defense-spending committee, according to people familiar with the matter. The Office of Congressional Ethics has informed aides to Murtha as well as Reps. Norm Dicks (D., Wash.) and Jim Moran (D., Va.) that it is no longer looking into allegations that they traded government funding earmarks for campaign donations. Dick’s chief of staff, George Behan, said the congressman received a phone call earlier this month from an official at the Office of Congressional Ethics informing him that he...