When Art Agnos campaigned for mayor of San Francisco in 1987, he articulated and defended the "left" isms--liberalism, environmentalism, and populism. He won.

Seeing Agnos as a defender of slowgrowth vs. progrowth, the city's progressives had high hopes. But to their disappointment, in the wake of the passage of Proposition M--the most restrictive growth control legislation of any large U.S. city--Agnos supported waterfront development and proposals to build a new baseball stadium in China Basin and a large residential and business development in Mission Bay. In 1991 Agnos ran for...