Napolitano previously represented the 34th district from 1999 to 2003, and the 38th district from 2003 to 2013. Due to redistricting, Napolitano ran for, and won re-election in the 2012 United States elections in California's 32nd congressional district against Republican candidate David Miller. In the 2014 midterm elections, Napolitano was reelected, defeating Republican challenger Arturo Alas.