S.C. Code Ann. § 7-25-110: Voting more than once at elections.

It is unlawful for a person qualified to vote at any general, special, or primary election for an office whether local, state, or federal to vote more than once at such election, for the same office. A person who violates the provisions of this section is guilty of a felony and, upon conviction, must be fined not less than one thousand dollars nor more than five thousand dollars and imprisoned not more than five years.