The Big Question: Is Joe Biden’s frontrunner status safe?

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The third Democratic Primary Debate has left some wondering if Joe Biden’s place as the frontrunner is still safe. According to many observers, he did no harm during his third debate performance, but is that really good enough when you’re running for president? Katy Tur speaks with MSNBC National Political Correspondent Steve Kornacki, Washington Post Senior Political Reporter Aaron Blake, Washington Post Political Reporter David Weigel, and Politico Senior Washington Correspondent Anna Palmer to discuss.