Ironically, California has had a constitutional spending cap — little known and of little effect — for nearly a quarter of a century. Experience with the existing limit illustrates that capping state spending is far easier said than done. The Gann limit, named after anti-tax crusader Paul Gann, said state spending could grow no faster than the rate of inflation and population growth. The cap was approved by voters. But over the years, subsequent voters approved a string of new ballot measures that created holes in the limit. Now, with Schwarzenegger's proposal, the state may come full circle, back to...