;Before 2000 Census In 1992, Mascara launched a primary challenge to U.S. Congressman Austin Murphy, a 16-year incumbent, in the 20th Congressional District, which comprised most of the southern suburbs of Pittsburgh. He lost the race by 3,000 votes. When Murphy retired two years later, Mascara handily won the Democratic primary to replace him. Although the 20th was considered the most Democratic district in Pennsylvania outside the districts based in Philadelphia and Pittsburgh, Mascara earned a narrow victory in the general election against Republican businessman Mike McCormick. Mascara faced the same opponent — and another narrow win — in 1996. However, the district reverted to form afterwards, and Mascara was unopposed in 1998. He easily won a fourth term in 2000. ;After 2000 Census The Republican-controlled state legislature significantly altered Mascara's district. The district was renumbered as the 18th District, and was considerably more affluent than its predecessor. It was also somewhat friendlier to Republicans, even though there were still 70,000 more registered Democrats in the district than Republicans. A large portion of the area Mascara had represented for the past eight years was shifted to the neighboring Johnstown-based 12th District, represented by 28-year incumbent Democrat John Murtha. The newly drawn district was widely criticized, since portions of several neighborhoods were split between two districts. In some cases, one side of the street was in the 18th while the other was in the 12th; in others, one side of the street was in the 18th while the other was in the Pittsburgh-based 14th. In one of the more extreme examples, most of Mascara's hometown, Charleroi—including most of his neighborhood—was drawn into the 12th. However, a long tendril extending from his house to Allegheny County remained in the 18th. Mascara opted to run against Murtha in the 12th's Democratic primary, since the redrawn 12th contained more of Mascara's old territory than Murtha's. After a bruising primary filled with negative campaigning by both candidates, Murtha won by a wider than expected margin. The 18th was taken over by Republican State SenatorTim Murphy.
Tenure
In Congress, Mascara was a moderate Democrat who opposed abortion and gun control, but whose voting record was otherwise consistent with the Democratic line. He was regarded as a political powerbroker among Democrats with a record of scoring federal money for local projects. In both Washington and his home district, Mascara projected a blue-collar, working class image. He liked to say frequently, "I don't go to the nightclubs and big restaurants.... I don't drink. I don't gamble. I don't whore around."
