As Iowa's Democratic caucuses approach, Vermont Sen. Bernie Sanders' message seems to be resonating with voters, though he still faces concerns he is too liberal to defeat President Trump. Along with Sens. Elizabeth Warren and Amy Klobuchar, he dashed to Iowa to campaign during a break from Trump's impeachment trial. Also there was Pete Buttigieg, who touted his electability. John Yang reports.
NPR's Tamara Keith and Amy Walter of the Cook Political Report join Judy Woodruff to discuss the latest political news, including whether enough Senate Republicans will vote to hear witnesses in the impeachment trial of President Trump and how 2020 presidential candidates are polling and campaigning in Iowa as its Democratic caucuses approach.