... if it finds the scales evenly balanced, the long-standing "presumption of constitutionality" to which every law enacted by Congress or a state or local government is entitled means that the person who seeks to have the law held unconstitutional has failed to carry the burden of proof on the question.
and ... But if the Court wrongly decides that a law enacted by Congress is not constitutional, it has made a mistake of considerably greater consequence.
Both quotes come from page 279 of "The Supreme Court" by William H. Rehnquist.
I'll put you down for crickets.