Here's an interesting fact to think about: There are exactly two people running unopposed for the SF Board of Supervisors, two people whose constituents support them strongly enough that nobody thinks a challenge would be effective (or necessary). And those are two supes who have consistently stuck to the progressive agenda and uncompromising progressive politics. They've done exactly what they promised to do four years ago; they haven't moved to the center, haven't tried to redefine their politics ... they are who they are. And that works.
Just worth noting.