Pennsylvania's 9th congressional district is a relatively safe seat for the Republicans. In 2004, for example, the Republican candidate, former businessman Bill Shuster, won a convincing majority over his Democratic opponent winning 70% of the vote. In 2006, he defeated teacher Tony Barr 60%-40%. Shuster was first elected to the district in 2001. According to the Cook Partisan Voting Index, the 9th is the most Republican district in Pennsylvania (and the Industrial Midwest), with a score of R +17.
Pennsylvania's 10th congressional district is located primarily in the northeast corner of the state. The district was one of the 12 original districts created prior to the 4th Congress. It is currently represented by Republican Tom Marino, who defeated Democratic incumbent Chris Carney during the 2010 U.S. House elections. In 2006, the 10th district experienced one of the greatest party shifts among all House seats that switched party control: in 2004, Sherwood won with an 86% margin of victory over his nearest opponent and two years later, Carney unseated Sherwood by a 53%-47% margin.