How can this possibly be?

How is it possible for the leftists to have an absolute stranglehold on San Francisco politics, especially for so long?

Is there not even a moderate wing, here?

Like most any place, the people were there first see themselves as priviledged and those who come later as undeserving. In SF, this takes the form of "natives" and "techies".

Left and right is the wrong way to look at it.