S.C. Code Ann. § 7-25-110
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 misdemeanor and, upon conviction, must be fined in the discretion of the court or imprisoned not more than three years.