MSNBC's Ari Melber hosts "The Beat" on Friday, March 8, and reports on President Biden campaigning in Pennsylvania after last night's fiery State of the Union and Donald Trump's legal battles. Melissa Murray and Andrew Weissmann join to discuss. Plus, film director and actor Mario Van Peebles joins Melber alongside political commentator Ayman Moyheldin in the latest "Fallback" installment.
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