On the eve of what many consider to be the most consequential election in recent American history, David Muir reports from ABC News' election headquarters with the powerhouse political team; Mary Bruce has details on Vice Pres. Harris' last full day of campaigning in Pennsylvania; in the final days of what former Pres. Trump says will be his last campaign, Rachel Scott has more on his closing argument; Pierre Thomas has the latest on the extraordinary steps being taken in battleground states to protect votes and workers counting them; and more on tonight's broadcast of World News Tonight with David Muir.