Expresses the sense of the Senate that: (1) Congress should take whatever steps necessary to affirm the fact that marriage in the United States shall consist only of the union of one man and one woman; (2) same-sex marriage is not a right, fundamental or otherwise, recognized in this country; (3) neither the U.S. Constitution nor any Federal law shall be construed to require that marital status or its legal incidents be conferred upon unmarried couples or groups; (4) the Defense of Marriage Act is a proper and constitutional exercise of Congress's powers under the effects clause of section 1 of Article IV; and (5) that no State, territory, or possession of the United States, or Indian tribe, shall be required to give effect to any public act, record, or judicial proceeding of any other State, territory, possession, or tribe respecting a relationship between persons of the same sex that is treated as a marriage under the laws of such entities, or a right or claim arising from such relationship.