S.C. Code Ann. § 8-13-1316
(A) Within an election cycle, a candidate may not accept or receive contributions from a political party through its party committees or legislative caucus committees which total in the aggregate more than:
(B) Party expenditures for partisan multi-candidate promotions for four or more candidates, including candidates for the United States Senate or the United States House of Representatives, where each candidate receives substantially equal treatment, both in terms of time or length discussed and prominence in presentation, shall not be included in the contribution limits under subsection (A). However, multi-candidate promotional expenditures are limited to: