Diagnosing California's Dysfunction

Kevin Drum basically attributes the California state government's utter dysfunctionality wholly to a law requiring two-thirds approval of the Legislature to pass a budget. I don't think anybody would dispute that this is not a good law. But 14 other states require more than a majority vote to pass a budget, including some (Arkansas and Oklahoma) that requires a 3/4 vote, so clearly there are some other factors at play.