The 538 Electoral College presidential electors meeting in state capitols across the country on Monday to cast votes for Joe Biden or President Trump include some notable names, including former President Bill Clinton and his wife, Hillary Clinton, the 2016 Democratic presidential nominee and a former secretary of state and New York senator.

Rules vary by state, but the electors are generally chosen by state parties and pledge to vote for that party’s nominee for president. If a party’s candidate wins the popular vote in a given state, its electors cast the Electoral College votes for that candidate. Biden is set to clinch the Electoral College and become president-elect by a 306-232 margin over Trump, based on results in the Nov. 3 election.