In more than three decades on the Supreme Court, Clarence Thomas has developed the most consistent and rigorous originalist jurisprudence of any justice in the Court's modern history. His approach — reading the Constitution according to its original public meaning at the time of ratification — is not merely a judicial method. It is a constitutional philosophy with profound implications for how we understand self-government, individual rights, and the limits of judicial power.
What Is Originalism?
Originalism holds that the meaning of the Constitution is fixed at the time of its ratification. When courts interpret constitutional provisions, they should ask: what did these words mean to the people who ratified them? What problem were they designed to solve?
This is distinct from "living constitutionalism," which holds that the Constitution's meaning evolves with changing social conditions and judicial understanding. For living constitutionalists, the Constitution is a framework to be adapted. For originalists, it is a law to be interpreted.
Justice Thomas holds specifically to "original public meaning" originalism — not the intent of the drafters, but the meaning a reasonably informed member of the public would have understood the text to have at ratification. This is both more democratic (it focuses on what was publicly ratified, not privately intended) and more legally rigorous.
Thomas's Distinctive Voice
What distinguishes Thomas from other originalist justices is his willingness to follow his methodology wherever it leads — including to conclusions that overturn decades of precedent or challenge the Court's own prior reasoning.
In United States v. Lopez (1995), Thomas wrote separately to question the expansive Commerce Clause doctrine that had accumulated since the New Deal, arguing the Court had drifted far from the original meaning of Congress's power to "regulate commerce among the several states."
In District of Columbia v. Heller (2008), Thomas joined the majority holding that the Second Amendment protects an individual right to keep and bear arms, and has consistently pressed for applying that right as robustly as the First Amendment.
In New York State Rifle & Pistol Association v. Bruen (2022), Thomas wrote the majority opinion establishing that Second Amendment challenges must be evaluated against the "historical tradition of firearm regulation" at the founding — a thoroughgoing originalist framework that transformed how lower courts analyze gun regulations.
The Incorporation Question
One of Thomas's most significant and distinctive contributions involves the Fourteenth Amendment's incorporation of the Bill of Rights against the states. The prevailing doctrine — "selective incorporation" through the Due Process Clause — applies most of the Bill of Rights to states but lacks a clear historical foundation.
Thomas has argued that incorporation should instead rest on the Fourteenth Amendment's Privileges or Immunities Clause, which was essentially written out of constitutional law by the Slaughter-House Cases (1873). This is the historically correct basis for incorporation, Thomas argues, even though restoring it would require overturning settled precedent.
Why Originalism Matters for Self-Government
The deeper case for originalism is democratic. When unelected judges update the Constitution's meaning to reflect contemporary values, they substitute their judgment for that of the people acting through the constitutional amendment process. The Constitution provides a mechanism for change — Article V — that requires broad democratic consensus. Judicial updating bypasses that process.
As Thomas wrote in Obergefell v. Hodges (2015), dissenting from the Court's recognition of a constitutional right to same-sex marriage: "The majority's decision is an act of will, not legal judgment." Whatever one thinks of same-sex marriage as policy, the question is whether the Constitution speaks to it — and Thomas argues it plainly does not.
A Legacy of Intellectual Courage
Clarence Thomas has spent his career writing opinions that challenge comfortable consensus — of the legal establishment, of his own colleagues, sometimes of political allies. His willingness to follow his methodology to unpopular conclusions is, whatever one's views on his specific outcomes, a model of judicial integrity.
As America marks 250 years of constitutional government, Thomas's jurisprudence stands as a sustained argument that the Constitution means what it says, that its meaning doesn't change to suit the times, and that fidelity to that meaning is the only honest form of constitutional interpretation.