The U.S. Supreme Court, delivering its second major blow in less than a year to civil rights organizations, on Tuesday upheld Michigan’s voter-approved ban on the use of race preferences in admissions at the state’s public universities.

In Schuette v. Coalition to Defend Affirmative Action, a 6-2 majority, splintering in their reasoning, held that Proposal 2, an initiative adopted in 2006, did not violate the U.S. Constitution. A sharply divided U.S. Court of Appeals for the Sixth Circuit had reached the opposite conclusion.