Bernie Sanders weighs in on Alexandria Ocasio-Cortez’s victory

In a Democratic congressional primary in New York, 10-term incumbent Congressman Joe Crowley was ousted by a 28-year old political newcomer - Alexandria Ocasio-Cortez - a self-proclaimed democratic socialist and former organizer for Bernie Sanders’ campaign. Senator Bernie Sanders joins Kristen Welker to discuss what this means for the future of the democratic party.