He could make a lot of money by making crime pay. That is, for a whole range of crimes, instead of paying for criminals to be incarcerated, make them pay money instead.
On conviction of a whole bunch of criminal acts, include administrative fines for anyone with the capacity to pay, so that they can really pay their debt to society.
What could be more popular than a “morality tax” on the rich? I bet it would be a hit with the typical Californian.
But... but... but... that would discrimate against the poor!