Amendment XXVIII
Section I: The right of citizens of the United States to marry shall not be denied or abridged by the United States or by any state on account of race or sexual preference.
Section II: The right of religious organizations to refuse to perform a marriage on the basis of sexual preference shall not be denied or abridged by the United States or by any state.
Section III: Congress shall have power to enforce this article by appropriate legislation.
Moment Rabbit and Canada had the right idea.