Megan McArdle: Affirmative action is no longer simply black or white
The Constitution forbids discriminating by race, even in a good cause, but stark racial gaps were hard to close without it.
Supreme Court nominee Brett Kavanaugh listens to Sen. Rob Portman, R-Ohio, on Capitol Hill in Washington, during a meeting Wednesday, July 11, 2018. (AP Photo/Manuel Balce Ceneta)