The demonstration attracted fans and foes of a proposed ballot measure that would levy a 5 percent income tax on the state’s wealthiest residents

BY KEVIN HAYNES, NEWS WRITER

Photo: Getty

A few dozen San Francisco residents rallied on Saturday to support—or spoof—a small but powerful contingent that doesn’t exactly have a reputation for begging for help: billionaires.

The March for Billionaires, staged in Alta Plaza Park in tony Pacific Heights, was set up in response to........

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