PORTLAND, Ore., Sept 1 (Reuters) - The 68-year-old mayor of a tiny town in Oregon has been charged with possession of methamphetamine, police said on Tuesday. Cletus Moore was arrested early on Monday morning during a traffic stop in Jefferson, Oregon, Marion County Sheriff's Office spokesman Chris Baldridge said. Moore is mayor of Idanha, a town of less than 140 people east of the state capital of Salem.