you can feel the tension even as you re driving up here. a lot of protesters holding signs, saying they want the children to be free. this is certainly going to be a dramatic day and visit for elizabeth warren just hours ahead of her debate performance. poppy and jim? mj lee there, thanks so much. going to be an interesting night tonight. let s discuss all the implications. cnn political analyst and national political correspondent for the new york times, alex burns, and cnn political commentator joe trippe. good morning to you. debating can be good for candidates. carr there are pitfalls, right. think of rick perry. famously could not name the three agencies he was going to knock down or the rubio/christie exchange. high stakes either in the positive or negative direction for candidates tonight. absolutely.