Is a new poll bad news for the Biden camp, or just an outlier?

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Conflicting 2020 polls are leaving us with a big question: is Joe Biden really in a virtual tie with Bernie Sanders and Elizabeth Warren? Steve Kornacki joins Chris Jansing to break down whether the poll suggesting the three-way tie is just an outlier. Weighing in: Washington Post Reporter David Weigel, Republican Strategist Susan Del Percio, and Daily Beast Columnist Jonathan Alter.