S.C. Code § 7-9-90
The state committee is composed of one member from each county, elected by the county conventions, the state chairman and state vice-chairman, elected by the state convention; and for the Republican and Democratic party state committees, the president of the South Carolina Federation of Republican Women and the president of the South Carolina Federation of Democratic Women ex officio are members of their respective state committees. Those persons named as members of the national executive committee of a national party are ex officio members of the state committee. If the office of state chairman or state vice-chairman becomes vacant, the state committee may fill the vacancy by electing a chairman or vice-chairman to serve until the organization of the next regular state convention. The state committee shall choose its other officers, not necessarily from the membership. The state chairman may vote only in case of a tie. The state committee shall meet at the call of the state chairman or any five members and at a time and place as he may appoint. Vacancies on the state committee, other than in the offices of state chairman and state vice-chairman, and the presidents of the women's federations must be filled by the respective county committees. The members of the state committee shall continue in office for two years from the time of their election, and until their successors are elected. The state committee shall nominate presidential electors and a vacancy in the state ticket of electors or in the national committee of a party must be filled by the state committee by a majority of the whole committee.
S.C. Code § 7-9-90