On June 1, 2010, the South Carolina Republican Party and one of its county units filed a federal lawsuit, hoping to win a ruling that the party may close its own primaries. That case is Greenville County Republican Party v State, 6:10-cv-1407. The case has not had a decision yet but will have a trial in mid-2013. Recently the Republican Party identified two expert witnesses who will testify. The state has not yet said who its expert witnesses will be.
South Carolina has never had registration by party, and has always provided that any registered voter may choose any party’s primary ballot. In the past the Democratic Party of South Carolina had a rule limiting its primary to whites only, but that was held unconstitutional in 1947.