New York City prepares to pick its next mayor

This Saturday, Democrats in America’s largest city will be asked to begin picking their nominee for mayor, a person whose influence is certain to extend beyond the five boroughs. But the voting system is different than anything New York City has used before, and there still isn’t a frontrunner. Dan digs in with Dana Rubinstein, a metro desk reporter with the New York Times, to learn more about the candidates, why crime and policing have become the top issue and what to watch heading into Saturday.