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First Read: A defiant Sanders threatens Democratic unity

Remember when it was the Republicans who had a unity problem? Well, consider the events and actions of the last four days on the Democratic side.
Democratic presidential candidate Bernie Sanders speaks during a campaign rally at Boardwalk Hall on May 9, 2016 in Atlantic City, N.J. (Photo by Mark Makela/Getty)
Democratic presidential candidate Bernie Sanders speaks during a campaign rally at Boardwalk Hall on May 9, 2016 in Atlantic City, N.J.
By Chuck Todd, Chuck Todd, Mark Murray, Mark Murray and Carrie Dann, Carrie Dann

First Read is a morning briefing from Meet the Press and the NBC Political Unit on the day's most important political stories and why they matter.