Mississippi has such easy ballot access requirements, no one has ever filed a lawsuit to overturn any of them.

Oklahoma’s failure to have any procedure for independent presidential candidates was declared unconstitutional in 1976 by the State Supreme Court. Oklahoma’s law that said petitions to create a new party must be completed in 3 months was struck down in 1984 in U.S. District Court. Oklahoma also lost a parallel case (not a ballot access case) that made it impossible for anyone to register as a member of an unqualified political party. However, the legislature then amended the law on registration to make the victory almost meaningless. Voters can only register into an unqualified party if that unqualified party was qualified during the preceding 4 years. Since there are no such parties, Oklahoma voters still can’t register into any unqualified party just now.