Jane Pauley sits down for a two-part interview with Vice President-Elect Kamala Harris and her husband, Douglas Emhoff. John Dickerson looks at the challenges facing Joe Biden as he is sworn in as the 46th President. David Martin examines the security measures being taken for the inauguration. Jim Axelrod meets comedian Sarah Cooper, who found overnight success with her lip-sync videos of President Trump. Lee Cowan examines free speech on social media. Rita Braver reviews the second impeachment of Donald Trump, and Mo Rocca delves into the little-known story of Charles Curtis, the first Native American vice president.