Yesterday (4/22/2014), in the case on affirmative action, Schuette v. Coalition, the Supreme Court ruled that voters could outlaw the use of race in college admissions.
According to the SCOTUS blog writeup about the decision (emphasis mine):
Those two Justices [Antonin Scalia and Clarence Thomas], however, would have gone considerably further, and declared that no policy that takes race into account can be upheld if it is not a direct remedy for intentional racial discrimination — in other words, they would allow race-conscious programs of dealing with policies that have a more negative effect on minorities, even if that is not intended.