Q Where did that two-thirds rule come from anyway?

A Ironically, the idea came from Democrats in the 1930s, according to Joe Mathews, a senior fellow at the New America Foundation. After a long period in the minority, Democrats came into power and wanted some protections in case they didn't remain there. Voters passed a constitutional amendment with a number of budget reforms, including the two-thirds rule for any budget that grew by 5 percent or more. Three decades later, California voters approved a follow-up measure saying that all budgets need to be passed by two-thirds of legislators before heading to the governor's desk. LINK