S.D. Codified Laws § 12-5-3.11
If a political party has no prescribed method of selection of slates of delegates and alternates to its national convention, the slates of delegates and alternates to the national convention shall be elected by the primary. Names of candidates for delegates and alternates to the national convention, in number equal to the entire number of the delegates and alternates to be selected, shall be grouped in a slate under the respective designations upon a single nominating petition. The nominating petition shall contain a statement indicating the candidates for delegates collective preference choice for President of the United States, if any, or that the candidates have no preference or are uncommitted. No name of any candidate for delegate or alternate may be filed in more than one slate.
SDCL 12-5-3.11