Senator Bernie Sanders has an energetic base, strong poll numbers, and now the perfect foil on the debate stage: billionaire Mike Bloomberg. The former New York City Mayor has built an impressive campaign apparatus, but is he clogging up the moderate lane to the Democratic nomination? And how will he perform in his first debate of the 2020 cycle? Plus, warning signs emerge that Nevada, like Iowa, might struggle to execute their caucuses. CNN political director David Chalian talks all things 2020 with CNN political reporter Dan Merica.

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