YAKIMA, Wash. -- As the primary election season heats up, a different kind of debate is taking shape in Yakima Valley's wine country: Do you close a wine bottle with a cork or a screwcap? The Hogue Cellars, a Prosser winery, recently made a case for screwcaps with the release of a five-year study showing that wines topped with a screwcap taste as good or better over time than wines topped with natural cork or other closures. The study backed up Hogue's decision to use screwcaps for all its wines, including its higher-priced reserved wines, beginning with its 2009 vintage.