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Elizabeth Warren gains ground over Biden and Sanders in new CBS News poll

Senator Elizabeth Warren is gaining ground in the 2020 Democratic presidential field. A new CBS News Battleground Tracker poll shows her with a slim, one-point edge over former Vice President Joe Biden. CBS News political correspondent Ed O'Keefe reports from Capitol Hill and CBSN political reporter Caitlin Huey-Burns joins CBSN to explain Warren's surge.
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