Since the 1992 presidential election, where Bill Clinton was elected president, most Pennsylvanians have voted for the Democratic presidential candidate. The lone outlier came during the 2016 race, when the Republican challenger, Donald Trump, earned 48.2% of the vote compared to Hillary Clinton's 47.5%.

The United States has a distinctive system by which presidents are elected indirectly. Every four years, the world tries to figure it out.