Unfortunatley the constituion is not written in stone. There are changes made to it all the time.
You're absolutely correct. Article V actually states this directly, and gives details on how amendments may be made:
The Congress, whenever two thirds of both Houses shall deem it necessary, shall propose Amendments to this Constitution, or, on the Application of the Legislatures of two thirds of the several States, shall call a Convention for proposing Amendments, which, in either Case, shall be valid to all Intents and Purposes, as part of this Constitution, when ratified by the Legislatures of three fourths of the several States, or by Conventions in three fourths thereof, as the one or the other Mode of Ratification may be proposed by the Congress; Provided that no Amendment which may be made prior to the Year One thousand eight hundred and eight shall in any Manner affect the first and fourth Clauses in the Ninth Section of the first Article; and that no State, without its Consent, shall be deprived of its equal Suffrage in the Senate.
Please visit the link provided for the complete story.
Oh, wait a minute; this can't be right. It doesn't say anything about nine people in black robes voting on what they want it to say.
The courts, up to and including the Supreme Court, do not have the right to amend the US Constitution. They are charged with resolving conflicts and declaring laws to be constitutional or unconstitutional based on the document itself and not their own personal interpretations of what it should mean.
For the role of the courts, see Article III on the same link.
TheRedneck




