Kelly Brough, pictured in this undated photograph, is a Denver mayoral candidate. (Photo provided by Kelly Brough) Denver’s first open mayoral race in 12 years is underway and on Monday the most recognizable candidate to date officially jumped into the expanding pool of would-be top executives in the city. Kelly Brough, the former president and CEO of the Denver Metro Chamber of Commerce and former chief of staff to then-Denver-mayor, now U.S.