The neighborhood at the center of San Francisco's thorniest debates has a new city supervisor. It's Dean Preston, the staunch progressive, who takes over after a divisive redistricting process and in the wake of Mayor London Breed's declaration of an emergency over the deadly drug trade in the neighborhood. Chronicle reporter J.D. Morris spent time with Preston and joins host Demian Bulwa to talk about Preston's challenges — including working with Tenderloin residents who want tougher law enforcement. | Unlimited Chronicle access: sfchronicle.com/pod

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