still some that aren't in the debate. this is the lineup for tonight. let's bring in nbc news national political correspondent steve kornacki. steve, let's take a look at the top polling candidates who are going to be on the stage tonight. >> look, this democratic race we talk about how there's dozens of candidates out there, but really so far there have been five candidates who have really made noise in the polling nationally and four of them are going to be on the stage tonight right next to each other, buttigieg, biden, sanders, harris. four of the top five polling candidates nationally in the democratic race are all there, the only one who is missing, elizabeth warren, obviously she was center stage last night. so in this one here you've got basically the heavy hitters and, again, the stage is kind of the podiums are arranged based on the polling here working from the outside in, so you've got the four of them right in the middle. of course, i think in particular what folks are looking at are these two right next to each other, biden and sanders. you saw that issue that came up