The law on affirmative action has been a tangled mess ever since the Court refused to do its duty in 1978. New cases give it a chance to make a clean exit, I write at Bloomberg Opinion.

This time, the court ought to issue a simpler ruling: It is illegal for colleges to treat applicants differently based on their race. Congress and the president decided that policy in 1964, and for the justices that should be the end of the matter.