It's the most important week and a half of the Democratic race: a debate, CNN townhalls, the South Carolina primary, then Super Tuesday. Is Senator Bernie Sanders running away with the nomination or will his rivals successfully paint him as an 'inflexible' ideologue? And can key endorsements revive former Vice President Joe Biden's momentum? CNN political director David Chalian makes sense of the rapidly evolving 2020 race with CNN senior Washington correspondent Jeff Zeleny.

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