Holden's district was drastically reconfigured as a result of legislative redistricting done in the Pennsylvania legislature in late 2011 following the results of the 2010 Census. The district lost Harrisburg and Lebanon, along with its shares of portions of Berks, Dauphin, Lebanon and Perry counties. To make up for the loss in population, the legislature pushed the district well to the north and east, adding Scranton, Wilkes-Barre, Pittston, and Easton, among other various towns in Luzerne, Lackawanna, Carbon, Monroe and Northampton counties. Holden now found himself running in territory that he did not know and that did not know him. The only county retained from his old district was his home county, Schuylkill County. As a result of these changes, the 17th was now considerably more Democratic than its predecessor, nearing 60 percent Democratic registration and leaving Holden vulnerable to a challenge to his left in the Democratic primary. Also, the League of Conservation Voters put Tim Holden on their "Dirty Dozen" list, targeting him for supporting then-President George W. Bush's energy policy, favoring oil production, and opposing President Obama's policies including development of clean energy.