In 2010, the Republican Party of South Carolina filed a lawsuit in federal court, seeking to close its primary. The case will finally have a trial in August 2013. The case is Republican Party of South Carolina v State, 6:10cv-1407. The Republican Party will attempt to show that non-members of the party have been voting in its recent primaries.
What part of the USA Const says that a faction of electors-voters in a State of the Union is an independent empire regarding PUBLIC nominations and PUBLIC elections ???
See the old Texas White Primary cases in SCOTUS – circa 1928-1932.
The First Amendment freedom of association clause. Also the U.S. signed the Copenhagen Meeting Document, and we and the other signing nations pledged not to treat political parties as arms of the state.