Former vice president Joe Biden lobbed attacks at former South Bend, Ind., mayor Pete Buttigieg and Sen. Bernie Sanders (I-Vt.) on Feb. 9. They returned fire and sent snipes at one another. Sen. Elizabeth Warren (D-Mass.) weighed in, as well. Read more: https://wapo.st/2StAynO. Subscribe to The Washington Post on YouTube: https://wapo.st/2QOdcqK

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