Rev. Al Sharpton, MSNBC national affairs analyst John Heilemann, HuffPost's Lydia Polgreen, and MoveOn's Karine Jean-Pierre on Sen. Harris' breakout moments in the first Democratic debate, including taking on frontrunner Joe Biden. 

WaPo's Ashley Parker, Rev. Al Sharpton, MSNBC national affairs analyst John Heilemann, HuffPost's Lydia Polgreen, and MoveOn's Karine Jean-Pierre on the other candidates who had strong performances in the debates and how the president is sizing up the competition.