S.D. Codified Laws § 2-15-4
Nomination of candidates for the office of delegate shall be by petition signed by not less than two nor more than five percent of the duly qualified electors of the district respectively in which the candidate or candidates reside, as shown by the total vote cast for the successful candidate for the office of Governor at the last gubernatorial election within said legislative district. Such nomination shall be without party or political designation but shall indicate thereon whether the candidate named in said petition is "in favor of," or "opposed to," the ratification of the proposed amendment, and said petitions shall be filed at the time and in the manner provided for filing nominating petitions for legislative representatives for the primary election, as now provided for.
SDCL 2-15-4