When the polls closed on election night in 2020, President Donald Trump appeared to be winning Pennsylvania. But over the next several days, as officials counted mail-in ballots, his lead shrunk and then disappeared. By Saturday, Joe Biden was the clear winner of Pennsylvania — and with it, the presidency. --SNIP-- If the electoral college comes down to Pennsylvania or Wisconsin, we might still face a long period where we don’t know the winner,” said Rachel Orey, an elections expert at the Bipartisan Policy Center.