Actually, in a way, so am I. From SFGate:

In July, before the court agreed to take the case, Brown went so far as to file his own friend-of-the-court brief asking that Chicago’s gun ban be overturned - arguing that if the court doesn’t act, “California citizens could be deprived of the constitutional right to possess handguns in their homes.”

His stance has angered a number of gun control proponents.

Julie Leftwich, legal director of Legal Community Against Violence, said this isn’t simply about Brown defending the Second Amendment - it also marks a dramatic turnabout from the administration of his Democratic predecessor, Bill Lockyer, a staunch gun control advocate.

“Jerry Brown hasn’t shown leadership in the legislative arena related to the issue of gun violence prevention … and he hasn’t sponsored or weighed in on any significant gun bills,” Leftwich told The Chronicle’s Carla Marinucci.

So I guess that according to Leftwich, the only plausible leadership an Attorney General could demonstrate on gun control is to support the complete ban on gun ownership.

For once, Brown is simply supporting the Constitution.