Candidates touring stage ahead of CNN debate; Warren and Sanders to share stage with moderates; CNN debates last chance for some Dems to break through

Gov. Steve Bullock touring stage ahead of CNN debate; O'Rourke, Buttigieg aim to recapture lost momentum; Poll: Biden top choice of Dems in new national pollTo learn more about how CNN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices