California State Assemblyman Tom Ammiano, a San Francisco Democrat, talks with Bloomberg’s Michael B. Marois about the state's property-tax law known as Proposition 13.   The measure, passed by voters in 1978, chopped tax rates by more than half and is also blamed for California's perennial budget crises, the proliferation of strip malls and auto dealerships, a slide in education spending and unequal tax bills among neighbors. They spoke on July 7.