Ahimsa Porter Sumchai is a remarkable success story, an African American woman who grew up in the housing projects and wound up graduating from UC San Francisco's medical school. She's running primarily on the issue of environmental justice for southeast San Francisco — and for years has been one of the loudest voices against the flawed Lennar Corp. redevelopment project at and the reuse plan for the contaminated Hunters Point Shipyard. Sumchai says the shipyard can never be cleaned up to a level that would be safe for housing, and she suggests that much of it should be used for parks and open space and possibly maritime and green-industry uses. She's highly critical of the low levels of affordable housing in market-rate projects all over the city, arguing that the developers should be forced to provide as many as 25 percent of their units at below-market rates. Sumchai is a physician, and she talks like one; her scientific language and approach sometimes confuse people. She suggested that one of the main causes of the homicide rate in the city is mental illness. "You can medically address people who are violent," she told us, saying the first step is to properly diagnose and treat depression in men.

Sumchai has some innovative ideas, including a universal child-care program for the city, paid for with a "fat tax" on unhealthy food. She's a strong supporter of public power and a longtime critic of Pacific Gas and Electric Co.

She can be abrasive and temperamental, but she's talking about critical issues that almost everyone else is ignoring. She deserves support.

Chicken John Rinaldi is the political surprise of the season, an artist and showman who has managed a traveling circus, run a bar in the Mission, put on unusual performances of every kind — and somehow managed to be the only person running for mayor who could qualify for tens of thousands of dollars in public funding. On one level Rinaldi's campaign is a joke — he told us repeatedly he has no idea what he's doing, and that if by some wild chance he were elected, he would hire people like Mecke and Sumchai to run the city. He's the Dada candidate, with his entire run something of a performance art piece.

But Rinaldi has a real constituency. He represents a dying breed in the city: the street artists, the writers, the poets, the unconventional thinkers with economically marginal lifestyles, who were once the heart and soul of San Francisco. It's hard to pin him down on issues since he seems to disdain any policy talk, but in the end, the very fact that he's running speaks to the pressure on artists and the lack of support the unconventional side of the art world gets in this increasingly expensive city.

Rinaldi is the protest candidate of all protest candidates, but he's going to get a lot of votes from people who think San Francisco needs to stop driving some of its most valuable residents out of town — and if that leads to a more serious discussion about artist housing, affordable housing in general, arts funding, and the overall crackdown on fun under Newsom, then it's worth giving Chicken John a place on the ticket.

There are several other candidates worthy of consideration. Josh ...