On today's Deep Background podcast, Colleen McCain Nelson and Melinda Henneberger join their Star Editorial Board colleagues Dave Helling and Derek Donovan to discuss the wild ride of this year's Democratic primaries. Just a few weeks ago, pundits were ready to write off Joe Biden's bid for the White House. But now that the field is down to two contenders, will Democrats rally behind the candidate they think is the best chance to unseat President Donald Trump?

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