To the Editor:If you haven't read Sunday's Des Moines Register's editorial, go to the Washington Free Public Library and read it. ?Empty Calories Can Help Replenish the State's Budget.? The article is about the rise of obesity in our population and our consumption of sugar-sweetened beverages and sodas.I have felt for some time that a good solution to our budget shortfall would be to tax (yes, a tax) of, say, ...