Affirmative Action study

I heard this guy being interviewed on NPR this a.m.-

Dr. Richard H. Sander, a UCLA law professor who describes himself as a lifelong Democrat sympathetic to the goals of affirmative action, is publishing this month in the Stanford Law Review a important article which concludes that affirmative action in law-school admissions has actually been harmful to African Americans.

He summarizes: “In the case of blacks, at least, the objective costs of preferential admissions appear to substantially outweigh the benefits. The basic theory driving many of these findings is known as the ‘academic mismatch’ mechanism; attending an advanced school where one’s credentials are far below those of one’s peers has a variety of negative effects on learning, motivation, and goals that harm the beneficiary of the preference."
Needless to say, the implications of this are many. If affirmative action hurts its supposed beneficiaries, then it is even more untenable than it already is.