(Seattle, WA)  --  Seattle Mayor Ed Murray says he's adding diet soda to the list of beverages he wants to tax to generate revenue for education and healthy-food programs.  Murray now calls the tax the "sweetened beverage tax."  The tax would amount to one-point-75 cents and would be added to naturally- and artificially-sweetened drinks including soda, energy drinks, juice, and sweetened teas in Seattle.  The proposed tax is opposed by retailers, who say it will drive up soft-drink prices and cost jobs.