OAKLAND — The rest of America may be fixating on Donald Trump vs. Hillary Clinton. But here in the liberal Bay Area, an even more divisive battle is playing out over the future of soda and the scope of the nanny state.Residents in San Francisco, Oakland and Albany, Calif., are voting Tuesday on a referendum that would impose penny-per-ounce taxes on sugary drinks from Coca-Cola to Gatorade in what has become the most expensive city-level ballot fight ever waged in the United States.The stakes could not be higher for the beverage industry, which fears being cast as the next tobacco — a public health pariah that is heavily taxed in cities and states across the U.S.