Capitol milestone: Murtha to become longest-serving congressman in Pa. historyBy RANDY GRIFFITH The Tribune-Democrat Published: January 30, 2010 11:19 pm JOHNSTOWN — John Murtha is a survivor. The 77-year-old Democrat has encountered wars, a flood, scandals, national and regional fiscal meltdowns and media firestorms in his life and political career that spans four decades. On Feb. 20, Murtha will begin his 37th year as representative in the 12th Congressional District, marking a milestone that will make him the longest-serving congressman in the history of Pennsylvania. He will surpass Republican Joseph McDade of Scranton, who retired in 1999 after 18 terms....