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Fmr. gun exec. who condemned industry runs for Montana governor

04:34

MSNBC’s Lawrence O’Donnell is joined by Montana Democratic gubernatorial candidate Ryan Busse to discuss his candidacy and the impact of The Washington Post’s decision to publish a new report in its series on AR-15 assault rifles that includes never-published photos and videos taken after 11 U.S. mass shootings from the past 11 years.