the tweak is critical. you can't just go out there and give them something to vote against but vote for. show why he can beat trump. show why his message is stronger. he has to contrast himself with the rest of the democratic field. if they show i am more moderate. i am good for the democratic primary and the strongest in the election. >> there is another debate. it will be the first debate in which he shares a stage with elizabeth warren. how do you expect those two to go after each other, or do you? >> elizabeth warren has a plan and policy for everything. she will want to talk about that. i don't know if she is going to attack biden in the way that kamala or corey did. i don't think she really needs