It's official: Dennis Herrera is running for mayor of San Francisco. We just spoke with his office who confirmed that, yes, the San Francisco City Attorney will make a go of it.

Herrera made the announcement early today. On his Facebook page, he writes: "I'm running for Mayor to make San Francisco a city that works. I've proven my mettle and ability to get the job done. I hope I can count on your support to make my case to voters: for the strong, principled, hands-on leadership we need in San Francisco's next Mayor."

More to come.

Update: Read Herrera's big announcement. Also, thoughts?