Last night’s debate had the potential candidates with the highest poll rankings on the stage that night, Bernie Sanders and Elizabeth Warren, fighting with other candidates instead of each other, and both emerged victoriously as a result. Tonight, the overall leading candidate, Joe Biden, has the center stage. Flanking him on either side: Kamala Harris, who upped her own profile by challenging him the last time, along with Cory Booker, Julian Castro, Kirsten Gillibrand, and Bill de Blasio.