ca carlos lopez. who will be asking some of these questions tonight. great to see both of you guys. tapper, since you were the last moderator of the republican debate back in simi valley in california, you have some unanswered questions, specifically can those translate for bernie sanders or hillary clinton and what are they? >> i think each candidate comes to tonight's contest with a goal. for hillary clinton, i would say she really needs to generate excitement. that's really been lacking with the registered voters of the general elect rat. for now, she needs to get democrats excited. can she excite democrats and deliver a knockout performance that really has people wanting to be excited about her. there are a lot of people around this it country who support her, but aren't excited about it. she needs to generate excitement. bernie sanders, he's been able to do that. he's been able to generate excitement, but the question for him is can he expand his appeal beyond the white progressive