when we're just looking at this is an interesting divide in the democratic party. let's look at biden and sanders quickly. if you look at this, it shows the divide going on. joe biden with iowa voters right now, he does better with voters that are more centris and are older. bernie sanders who happens to be older does better with younger voters who tend to be liberal. a lot on the line tonight. these three democrats we're going to hear from are trying to get voters to back them, fred. >> all fascinating. mark preston, thank you so much in austin, texas. let's talk further about this. with me is charlie dent, former republican of pennsylvania, and andrew guillen and cnn historian. thank you so much. these new polling numbers out of iowa showing joe biden, bernie sanders at the top, even though biden has not officially made an