By Steven T. Jones
Environmentalists and alternative transportation activists are winning some key endorsements in the run up to next month's second annual Healthy Saturdays showdown. Mayor Gavin Newsom vetoed  the Golden Gate Park road closure to cars last year and doesn't seem interested  is pushing for a compromise on a measure he criticizes  as too polarizing (ironically, his detachment from the issue is precisely what's feeding the polarization). But last year's swing vote on overrriding the veto, Sup. Bevan Dufty, has indicated an openness to supporting it this year. And that became all the more likely last night when the San Francisco Democratic Party County Central Committee (DCCC) endorsed the measure. They join other key Dufty allies in endorsing the measure, including the Harvey Milk Democratic Club and Alice B. Toklas Democratic Club, as well as the Young Democrats club and both Senate contenders: Mark Leno and Carole Migden. The first committee hearing on the measure is April 9.