Election Day 2020 is officially upon us. Millions of voters across the country are expected to show up at polling places to cast their ballots. That's on top of the nearly 100 million who have already voted in person or by mail. There are also growing concerns that the bitterness and animosity over the presidential election will not end when the polls close Tuesday night. From coast to coast, cities are preparing for possible protests, civil unrest and violence, regardless of the election's outcome.