Whether the Fourteenth Amendment requires a State to license a marriage between two people of the same sex.
Holding
Yes. Same-sex couples may exercise the fundamental right to marry, and States may not exclude them from civil marriage on the same terms and conditions available to opposite-sex couples.
Reasoning
The Due Process Clause protects fundamental liberties extending beyond rights expressly listed in the Constitution. Although history and tradition guide the identification of those liberties, they do not permanently fix their boundaries. Courts must use reasoned judgment to determine whether a claimed liberty is central to individual dignity and autonomy; otherwise, past exclusions could indefinitely justify themselves.
Marriage has long been recognized as a fundamental right. Loving, Zablocki, and Turner did not treat marriage as a collection of historically fixed eligibility rules. Instead, they protected the comprehensive right to marry against unjustified exclusion of interracial couples, parents behind on child-support payments, and prisoners. The proper question was therefore whether same-sex couples may be excluded from the existing fundamental right to marry, not whether they sought a wholly new right labeled “same-sex marriage.”
The Court identified four reasons marriage is fundamental, each of which applies equally to same-sex couples. First, choosing whether and whom to marry is a profound act of personal autonomy and self-definition. Second, marriage protects an intimate, enduring two-person union marked by commitment, companionship, and mutual care. Third, marriage safeguards children and families by providing stability, legal recognition, and material protections; excluding same-sex couples harms both the couples and their children. Fourth, marriage is a keystone of the social order, carrying a broad set of legal rights, responsibilities, and public recognition that States may not deny to same-sex couples without inflicting serious dignitary and practical injury.
Equal protection reinforces the due process conclusion. The Due Process and Equal Protection Clauses are distinct but can illuminate one another, particularly where a law both burdens a fundamental liberty and imposes unequal treatment. Because the challenged laws denied same-sex couples access to a fundamental right and all the benefits tied to marital status, they imposed a grave and continuing inequality that disrespected and subordinated them.
The Court rejected the argument that democratic deliberation required judicial restraint. Democracy ordinarily governs social change, but fundamental rights may not be left to majority vote. Once state law violates a constitutional right, injured individuals may seek judicial redress without waiting for legislatures or referenda to act. The Court also found no sound basis for the prediction that allowing same-sex couples to marry would harm opposite-sex marriage or third parties.
The Court overruled Baker v. Nelson, its 1972 summary dismissal of a same-sex-marriage claim, because Baker was incompatible with the Court’s later understanding of liberty, equality, marriage, and the constitutional rights of gay and lesbian persons.