him. >> and he's gotten support from people like john lewis and jim clyburn as well in the last couple of weeks. jeremy, the president of the united states obviously not been shy about going after some of the members of the field in the democratic primary here. but hasn't had much to say about senator harris since this campaign launched and you have new reporting that they're concern about her as an opponent. >> well, willie, what joe biden's performance and kamala harris's confrontation of him on thursday night did was reset a couple of important assumptions about the race. one, it gave us a glimpse of what she might look like as a debate sparring partner against president trump. and it was a pretty fierce performance. number two it kind of shattered this aura of invincibility, of dominance, that joe biden had enjoyed for really long time. and the trump campaign -- president trump himself especially hasn't really figured out how to deal with kamala harris.