Follow 538 and ABC News for live updates on the presidential election between Kamala Harris and Donald Trump, and key races for U.S. Senate, House, governor and more.

Most election forecasters ahead of the election considered Pennsylvania the most likely tipping-point state, or the one that would push the race in either candidate's favor. If history holds, the remaining "blue wall" states — Michigan and Wisconsin — may also go the same way.

The state has leaned more Republican in recent years ... with a particularly heavy union presence in the swing states. Traditionally Democratic supporters, the International Brotherhood of Teamsters caused uproar by deciding earlier this year to endorse ...