Incumbent Democratic Senator Bob Casey Jr. sought reelection against Republican Congressman Lou Barletta in the general election.
In January 2018, the Pennsylvania Supreme Court struck down the state's congressional map, ruling it had been unfairly gerrymandered to favor Republicans.
[3] A special election for Pennsylvania's 18th congressional district was held on March 13, 2018, following the resignation of Republican Rep. Tim Murphy.
Voters in Pennsylvania elected 18 candidates to serve in the U.S. House, one from each of the 18 congressional districts.
Wolf and Fetterman went on to defeat the Republican ticket of State Senator Scott Wagner and businessman Jeff Bartos.