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It's not over on guns

14:27

The NRA's annual convention kicks off in Houston, while a new round of polls show trouble for U.S. senators who stood with the gun lobby instead of with the majority of voters on background checks.  MSNBC's Lawrence O'Donnell discusses with the Washington Post's E.J. Dionne, the Huffington Post's Sam Stein, and The Grio's Joy Reid.