LOS ANGELES (Reuters) - Taking inspiration from a landmark 1970s tax revolt, a determined group of activists say the moment is right for another voter uprising in California, where recession-battered residents have been hit with the highest income and sales tax rates in the nation. And like Proposition 13, the 1978 ballot measure that transformed the state's political landscape and ignited tax-reform movements nationwide, they see the next backlash coming not from either major political party, but from the people. If the anti-tax crusaders can galvanize voter discontent, they hope to roll back the latest tax hikes, impose permanent, iron-clad...