Key impeachment witness Gordon Sondland fired; New poll shows Sanders, Buttigieg in tight race in New Hampshire

Key impeachment witness Gordon Sondland fired; On same day witness Lieutenant Colonel Vindman & brother fired; Trump adviser on impeachment firings: "Flushing out the pipes"; New poll shows Sanders, Buttigieg in tight race in New Hampshire; Biden Campaign downplays expectations in New Hampshire; Biden promotes Obama veteran in staff change after Iowa loss; Some Sanders fans using hostile tactics to drown out critics; Soon: Democrats to face off in debate ahead of New Hampshire PrimaryTo learn more about how CNN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices