Anderson Cooper 360

Bruising Night for Joe Biden Puts Him on the Defensive for the First Time During 2020 Campaign Season; Biden Touts "Lifetime Commitment to Civil Rights" After Harris Slammed Him on Race, Busing in Rough Debate; Biden's Statements, Positions on School Busing Could Haunt Him; Pres. Trump Praises Saudi Prince, After Cozying-Up to Putin and Pining for Kim Jong Un; Former Pres. Carter Says Russian Interference in 2016 Would Show Pres. Trump Didn't Actually Win the Election; Mayor Pete Buttigieg Splits Time Between Campaign and Police Shooting Crisis via Knit