do you think is behind biden's appeal? is it name recognition, is it nostalgia for all things obama? something else. >> the appeal of joe biden is something called joe biden. i think that he is been -- he's a fixture in american politics. he's well-known. he's had his gaffes and mistakes but nobody questions his heart. sometimes they might question his mouth and judgment on a couple of things. nobody questions his heart and we're in a period of national heartbreak. i don't care if you're for trump or not. you cannot feel good about the way that we have come to see each other, talk about each other, feel about each other and joe biden is somebody who i believe in his heart wants to be a unifier. >> in a peace this week, some of biden's top aides i need to be ready to go with a moments notice if joe biden announces. what are the biggest pros and the biggest cons of a biden 2020