very common views at the time of the framing of the Constitution. For example, George Mason explained during the constitutional convention that judges "could declare an unconstitutional law void. But with regard to every law, however unjust, oppressive or pernicious, which did not come plainly under this description, they would be under the necessity as Judges to give it a free course." For a number of years, the courts were relatively deferential to Congress. Justice Washington put it this way, in an 1827 case: "It is but a decent respect to the wisdom, integrity, and patriotism of the legislative body, by which any law is passed, to presume in favor of its validity, until its violation of the Constitution is proved beyond a reasonable doubt." Although judges usually adhered to this principle that a statute could only be deemed unconstitutional in case of a clear contradiction until the twentieth century, this presumption of constitutionality weakened somewhat during the twentieth century, as exemplified by the Supreme Court's famous footnote four in United States v. Carolene Products Co., 304 U.S. 144 (1938), which suggested that statutes may be subjected to closer scrutiny in certain types of cases. Nevertheless, the federal courts have not departed from the principle that courts may only strike down statutes for unconstitutionality. Of course, the practical implication of this principle is that a court cannot strike down a statute, even if it recognizes that the statute is obviously poorly drafted, irrational, or arises from legislators' corrupt motives, unless the flaw in the statute rises to the level of a clear constitutional violation. In 2008, Justice John Paul Stevens reaffirmed this point in a concurring opinion: "[A]s I recall my esteemed former colleague, Thurgood Marshall, remarking on numerous occasions: 'The Constitution does not prohibit legislatures from enacting stupid laws.'" In the federal system, courts may only decide actual cases or controversies; it is not possible to request the federal courts to review a law without at least one party having legal standing to engage in a lawsuit. This principle means that courts sometimes do not exercise their power of review, even when a law is seemingly unconstitutional, for want of jurisdiction. In some state courts, such as the Massachusetts Supreme Judicial Court, legislation may be referred in certain circumstances by the legislature or by the executive for an advisory ruling on its constitutionality prior to its enactment (or enforcement).