If any legal voter of the state, either individually or on behalf of an organization, desires to petition the legislature to enact a proposed measure, or submit a proposed initiative measure to the people, or order that a referendum of all or part of any act, bill, or law, passed by the legislature be submitted to the people, he or she shall file with the secretary of state:

(1) A legible copy of the measure proposed, or the act or part of such act on which a referendum is desired;

(2) A signed affidavit, or electronic submission, that the sponsor is a registered voter; and

(3) A filing fee prescribed under RCW 43.07.120.