The U.S. Supreme Court won't intervene in a dispute over Michigan's ban on straight-party voting.
The court turned down an appeal Friday, which means the ban will go into effect in the November election.
Voters can't use a single mark to quickly pick all candidates of a single party.
A Detroit federal judge said the ban violated the rights of black voters.
But an appeals court last week suspended that decision and said the ruling likely will be overturned.
The Supreme Court rejected an appeal, although justices Sonia Sotomayor and Ruth Bader Ginsburg wanted to hear it.
The Republican-controlled state Legislature and Governor Rick Snyder eliminated straight-party voting, saying people should study candidates instead of simply choosing a party.