Who in the Democratic presidential field is the biggest threat to Joe Biden?
Published 20 Jun, 2019 19:51 | Updated 26 Jun, 2019 06:31Joe Biden remains the front-runner in the race for the 2020 Democratic nomination but is Elizabeth Warren gaining on Bernie Sanders in the fight for second place? Editorial director and publisher of "The Nation" Katrina Vanden Heuvel weighs in.
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