Pennsylvania moved its primary from April 28 to June 2 because of the coronavirus pandemic. In the 2016 general election, Donald Trump won Pennsylvania with 48.18%, compared with Hillary Clinton’s 47.46%. Before Trump’s win, the state had voted for Democrats in six consecutive presidential elections. The Democratic base in Pennsylvania is located in urban Philadelphia and Pittsburgh. The GOP base is located in the more rural central portion of the state. Pennsylvania has three main battlegrounds: Philadelphia suburbs, with a large number of middle-income and affluent fiscally conservative and socially liberal voters; the Pittsburgh suburbs, with older, socially conservative Democrats considered to be swing voters; and the Scranton-Wilkes Barre region of socially conservative Reagan Democrats. Erie County can tilt an unusually tight race. The state Legislature is controlled by Republicans, while the governor’s office is held by a Democrat. Its congressional delegation is split between the parties.