Joe Biden topped the polls in eight states on Super Tuesday, including surprise wins in Minnesota and Massachusetts. Bernie Sanders lead in four states, including California.As in earlier contests, exit polls show a sharp divide in the party: young and Latino voters overwhelming prefer Sanders, while older and black voters generally side with Biden.This episode: White House correspondent Tamara Keith, campaign correspondents Asma Khalid and Scott Detrow, and national political correspondent Mara Liasson.