The historic and momentous 2020 American presidential election saw the divided nation reeling from violence, insurrection and internal division in the midst of a raging pandemic. CBS News' Norah O'Donnell scans the personal side of the election's outcome, with in-depth reports by Gayle King, Erin Moriarty and Peter Van Sant. "One Nation: Indivisible" delves into little-seen dramatics within the history-making ticket and what may become its lasting effects.