two days until the first democratic debate on cnn. five candidates you see here will be on stage in las vegas. tuesday night will be the first time that americans will see the top two candidates hillary clinton and bernie sanders facing off. the other three there on stage together. take a look at this huge crowd in boulder, colorado, for bernie sanders, which was saturday. 9,000 people came out to cheer him on and 13,000 the night before and he is heading to vegas. let s bring in stephen collinson. the analysts say they compare sanders rallies to that of a ro concert and the clinton crowd to those of a lecture. these crowds have to be helping him, right? certainly. there is a real contrast between the events that bernie sanders is doing, observe in big sports