Gavin Newsom knew that if he got elected lieutenant governor, the supervisors would be able to choose his replacement. That was part of the deal. Now he wants to game the system, and delay his swearing in  until the new board takes over. The claim: "The board should pick a caretaker, not a politician."
A politician? In the mayor's office? Um, dude: What are you?
This is not only annoying and dubiously legal, but stupid. Does Newsom really think the incoming board is more likely to choose a caretaker? No such luck. The incoming board is likely to choose David Chiu -- a politician who will likely run in November.
Besides, the state Constitution says the lite guv takes office Jan. 3rd. So if Newsom refuses to take the oath of office, one could certainly argue that he has vacated that position, meaning the governor, Jerry Brown, could appoint a replacement. I think if Newsom carries through with his lame threat that Jerry should do exactly that.
PS: Newsom also said he "can’t just walk away and see everything blow up and there are a few politicians in this town that want to serve on ideological agenda.” Let's be clear here: Newsom also has an ideological agenda. He thinks same-sex marriage should be legal and taxes should be low. He thinks it should be illegal to sit on the sidewalk. He's got plenty of ideology.
He just doesn't want a mayor whose ideology he disagrees with. Too late, Gav: You decided to leave the city. Now leave the rest of us alone to deal with the consequences.