The sponsor of a referendum may begin the referendum process by presenting for registration a petition requesting the referral of an adopted ordinance to the people for acceptance or rejection, containing a full text of the adopted ordinance, and submitting five (5) copies of the same to the County Auditor, along with the name and post office address of the sponsor and a supporting affidavit that the sponsor is a legal voter, or organization of legal voters, in Clallam County, Washington.