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(From left) Mayors Kevin Johnson of Sacramento, Julián Castro, Michael Hancock of Denver, and Angel Taveras of Providence. Photo by Andrew Moore.

(From left) Mayors Kevin Johnson of Sacramento, Julián Castro, Michael Hancock of Denver, and Angel Taveras of Providence. Photo by Andrew Moore.

(From left) Mayors Kevin Johnson of Sacramento, Julián Castro, Michael Hancock of Denver, and Angel Taveras of Providence. Photo by Andrew Moore.