Greenbrae is lower upper class yuppie scum.
Which is in Marin County. Uber Liberal.
As Ballygrl noticed earlier, a comment left at the article sums the situation perfectly.
From the Wikipedia entry for Marin County:
The racial makeup of the county was 84.03% White, 2.89% Black or African American, 0.43% Native American, 4.53% Asian, 0.16% Pacific Islander, 4.50% from other races, and 3.47% from two or more races.
However, the "ooze" is spilling into Marin. Marin can't hold it out and away. TPTB keep trying to keep the invisible "fence" around Marin charged with electricity, but danged those grids...