 The present cases are not governed by Grutter.Part III B (joined only by a plurality of the Court) rejected the notion that racial balancing could be a compelling state interest, as to do so "would justify the imposition of racial proportionality throughout American society, contrary to our repeated recognition that "[a]t the heart of the Constitution's guarantee of equal protection lies the simple command that the Government must treat citizens as individuals, not as simply components of a racial, religious, sexual or national class.