> Through their ruling of Marbury v. Madison, the court declared the Constitution as law.

The constitution declares itself as supreme law. See the Supremacy Clause:

  This Constitution, and the Laws of
  the United States which shall be
  made in Pursuance thereof; and all
  Treaties made, or which shall be
  made, under the Authority of the
  United States, shall be the supreme
  Law of the Land; and the Judges in
  every State shall be bound thereby,
  any thing in the Constitution or
  Laws of any State to the Contrary
  notwithstanding.

The order in which the supreme laws are given is: constitution, statutes, treaties.