How 2020 Democrats are faring in new national poll

Six Democratic presidential candidates will debate Wednesday night in Nevada, with a new face joining onstage. Michael Bloomberg will participate for the first time this primary cycle, as scrutiny over his record intensifies. Lisa Desjardins reports on the candidate's efforts to appeal to minority voters ahead of the Nevada caucuses, and Judy Woodruff talks polling with NPR’s Domenico Montanaro.