Every county elected official, at the time of his or her election, shall be a citizen of the United States and a resident and registered voter of Clallam County. Each member of the Board of County Commissioners shall, in addition, be a resident of the district which he or she represents. If any change in district boundaries shall cause a Commissioner to no longer be a resident of the district which he or she represents he or she shall continue to hold office for the remainder of his or her term and until a successor has been elected and certified.