Iowa Poll: First poll of likely caucusgoers finds Biden, Sanders, O'Rourke atop the field

Former Vice President Joe Biden holds the pole position in the first CNN/Des Moines Register/Mediacom poll among likely 2020 Democratic caucusgoers, with Vermont Sen. Bernie Sanders and Texas Rep. Beto O'Rourke joining him as the only possible candidates in the field with double-digit support.

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