Constitutional Interpretation: Textualism, Originalism, Purposivism

The main methods of constitutional interpretation are textualism, originalism, purposivism, living constitutionalism, and structural interpretation, along with the canons of construction that judges use as tiebreakers when text is unclear. Each method offers a different answer to the same underlying problem: how a document written in broad strokes and ratified over two centuries ago should govern modern legal disputes. The approach a judge favors shapes the scope of individual rights, the limits of federal power, and the outcome of cases where the text alone does not resolve the question.

Textualism

Textualism treats the written words of the Constitution as the law. A textualist judge asks what the words of a provision would mean to an ordinary, competent reader. If the text is clear, the inquiry ends there. If the words are ambiguous, the judge turns to established rules of construction to resolve the ambiguity rather than speculating about what the authors privately intended or what policy outcome would be most desirable.¹

The goal is to limit judicial discretion. Textualists argue that judges best respect the authority of the people who enacted the law when they follow the text rather than layering in purposes or values the text does not express. A textualist reading of the Eighth Amendment’s ban on “cruel and unusual punishments,” for instance, focuses on what those words meant as written.² Some textualist scholars read “unusual” as a term of art referring to novel government practices that broke from established common-law tradition, which would narrow the clause to forbidding new, harsher penalties rather than allowing the definition of cruelty to shift with modern attitudes.

Textualism Is Not Strict Constructionism

Textualism is often confused with strict constructionism, but the two are meaningfully different. Justice Antonin Scalia, the most prominent modern textualist, explicitly rejected the strict-constructionist label: “I am not a strict constructionist, and no one ought to be.” Strict constructionism reads text as narrowly as possible, sometimes to the point of absurdity. Scalia’s position was that “a text should not be construed strictly, and it should not be construed leniently; it should be construed reasonably, to contain all that it fairly means.” Textualism looks for a fair reading of the whole text, not the most cramped one.

The Supreme Court’s 2008 decision in District of Columbia v. Heller illustrates textualist reasoning in constitutional cases. Justice Scalia’s majority opinion dissected the Second Amendment phrase by phrase, examining what “arms,” “keep,” “bear,” “militia,” “well-regulated,” and “the people” would have meant to an ordinary reader at the founding, drawing on other parts of the Constitution, contemporaneous state constitutions, and founding-era dictionaries.³ The analysis also shows how textualism and originalism frequently overlap in practice, even though they are conceptually distinct.

Originalism

Originalism fixes the Constitution’s meaning to the time it was adopted. Where textualism asks “what do these words mean?”, originalism asks “what did these words mean then?” The difference is subtle but real: textualism can be applied using modern dictionaries, while originalism insists on historical ones. The method divides into two branches.

Original intent tries to recover what the specific people who drafted or ratified a provision believed it meant. Practitioners look to sources outside the text, such as debates at the Constitutional Convention and The Federalist Papers, to uncover those private understandings.³

Original public meaning, the more widely practiced form today, takes a different angle. Instead of asking what James Madison thought a clause meant in private, it asks what a reasonable, well-informed member of the public would have understood the text to mean when it was ratified. This approach draws on founding-era dictionaries, comparable provisions in state constitutions, and the broader legal context of the period.³ The appeal is stability: if meaning is fixed at ratification, judges cannot quietly update the Constitution’s commands to match their own preferences. Critics counter that locking in 18th-century meaning gives too little weight to how dramatically society has changed since the founding.

Purposivism

Purposivism looks past the literal words of a law and asks what problem the lawmakers were trying to solve. If the text is ambiguous, a purposivist judge resolves the ambiguity by choosing the interpretation that best advances the law’s underlying goal. The Congressional Research Service describes the core idea this way: purposivists treat legislation as a purposive act and argue courts should interpret statutes to execute that legislative purpose.¹

To identify that purpose, purposivist judges look at what the CRS calls the statute’s “policy context,” including the problem that prompted the law, legislative history, and the consequences that different readings would produce. Two influential mid-20th-century legal scholars, Henry Hart and Albert Sacks, argued that judges should presume the legislature was “made up of reasonable men pursuing reasonable purposes reasonably,” unless the text unmistakably shows otherwise.¹

A classic illustration is Church of the Holy Trinity v. United States (1892). A federal statute broadly prohibited bringing foreign workers into the country under contract. A church had contracted with an English minister to serve as its pastor. The words of the statute plainly covered the arrangement, but the Supreme Court refused to apply them literally. The Court reasoned that “a thing may be within the letter of the statute and yet not within the statute because not within its spirit nor within the intention of its makers,” and concluded that Congress had been targeting cheap imported labor, not clergy.⁴ Textualists criticize this kind of reasoning as giving judges too much room to override the words the legislature actually chose.

Living Constitutionalism

Living constitutionalism treats the Constitution as a document whose meaning evolves alongside society. Proponents argue that phrases like “due process,” “equal protection,” and “cruel and unusual” were deliberately written at a high level of abstraction, inviting future generations to pour new content into those principles as circumstances change. Where originalism pins meaning to the 18th century, living constitutionalism says that meaning grows.

The Supreme Court gave this approach one of its most quoted formulations in Trop v. Dulles (1958), declaring that the Eighth Amendment “must draw its meaning from the evolving standards of decency that mark the progress of a maturing society.”⁵ Under that standard, a punishment that was acceptable in 1791 can become unconstitutional if a modern national consensus views it as barbaric. The same logic applies outside the Eighth Amendment. In Obergefell v. Hodges (2015), the Court held that the Fourteenth Amendment requires states to license and recognize same-sex marriages, reasoning that marriage is a fundamental liberty and that denying it to same-sex couples violates both due process and equal protection.⁶

Critics see this approach as constitutional amendment through the back door. If judges can update meaning without the formal amendment process, the argument goes, then the Constitution means whatever five Justices say it means at any given time. Proponents respond that forcing modern society to live under 18th-century assumptions would make the document irrelevant or unjust, and that the broad language was chosen precisely to allow adaptation.

The Moral Reading

Legal philosopher Ronald Dworkin pushed the living-constitutionalism idea further with what he called the “moral reading.” Dworkin argued that fidelity to the Constitution demands that judges make moral judgments, interpreting its abstract language by reference to principles of political decency and justice. This approach brings political morality into the heart of constitutional law, which is exactly what makes it controversial. Critics worry it gives judges license to substitute personal moral views for legal analysis.

Structural Interpretation

Structural interpretation draws meaning not from any single clause but from the Constitution’s overall design. Rather than parsing specific words, a structuralist asks what relationships the document creates between institutions and what powers those relationships imply. The Constitution Annotated notes that this method gives rise to “some of the most important relationships that everyone agrees the Constitution establishes,” including separation of powers among the three federal branches, federalism between the national and state governments, and the relationship between government and the people.⁷

The most famous structural argument is McCulloch v. Maryland (1819). The Constitution does not explicitly grant Congress the power to create a national bank. Chief Justice Marshall reasoned that because the Constitution grants Congress the power to tax, borrow money, regulate commerce, and wage war, the power to charter a bank is a necessary tool for executing those explicit powers. Marshall rejected a cramped reading of the Necessary and Proper Clause, writing that the Constitution was “intended to endure for ages to come, and consequently, to be adapted to the various crises of human affairs.”⁸ The key move was looking at the Constitution’s structure as a whole, not just the text of a single clause.

Canons of Construction

When text is genuinely ambiguous, judges reach for canons of construction: longstanding interpretive rules that act as tiebreakers. These are not binding laws but principles that guide how courts resolve unclear language. They fall into two broad categories.

Textual canons use the surrounding language to clarify a vague term. Two of the most common are “a word is known by the company it keeps” (if a term appears in a list of similar items, its meaning is shaped by the other items on the list) and the related principle that a general catchall at the end of a specific list is limited to things of the same type as the listed items. If a statute prohibits bringing “knives, swords, daggers, or other weapons” into a building, the catchall “other weapons” would cover similar bladed instruments, not necessarily a firearm.

Substantive canons push outcomes in a particular direction regardless of the text. Two are especially important in constitutional law. The rule of lenity requires courts to interpret ambiguous criminal statutes in favor of the defendant, ensuring people have fair notice of what conduct is illegal. The constitutional avoidance canon tells courts that if a statute can reasonably be read two ways, they should choose the reading that avoids raising a serious constitutional question.⁹ These canons often shape decisions without drawing much public attention.

How Precedent Constrains Every Method

Interpretive methods determine how a court reads the Constitution when a question is fresh. After a decision is on the books, the doctrine of stare decisis determines how tightly future courts are bound by it. The phrase means “to stand by things decided”: once a court resolves a legal question, other courts facing the same question should generally follow that earlier ruling.

The doctrine works in two directions. Vertical stare decisis means lower courts must follow the rulings of higher courts in the same system. Horizontal stare decisis means a court typically follows its own prior decisions, so the Supreme Court will generally adhere to its past rulings even when individual Justices would have decided the original case differently.¹⁰ The practical effect is that no interpretive method operates on a blank slate. A textualist or originalist judge on the Supreme Court still has to reckon with decades of decisions that may have read a clause differently.

The presumption in favor of precedent is strong but not absolute. In Seminole Tribe of Florida v. Florida (1996), the Court explained that “when governing decisions are unworkable or are badly reasoned, this Court has never felt constrained to follow precedent,” adding that this “has been particularly true in constitutional cases, because in such cases correction through legislative action is practically impossible.”¹¹ When the Court misinterprets a federal statute, Congress can pass a new law to fix the error. When it misinterprets the Constitution, the only corrective outside the Court itself is a constitutional amendment, so the Court gives itself more room to revisit constitutional precedents than statutory ones.

How the Methods Interact in Practice

Interpretive methods rarely operate in isolation. A single opinion might use textual analysis to parse the words of a clause, originalist evidence to confirm what those words meant at ratification, structural reasoning to understand the clause’s role within the broader constitutional framework, and stare decisis to decide whether a prior interpretation of the clause should stand. Judges tend to lean on one method more heavily than others, but few are pure adherents of any single school.

The real stakes emerge when the methods point in different directions. An originalist reading of the Fourteenth Amendment might support a narrower set of rights than a living-constitutionalist reading. A purposivist approach might uphold a statute that textualism would strike down. When those conflicts surface, the method a judge chooses effectively determines the outcome, which is why judicial nominations so often turn on questions of interpretive philosophy. The framework is neutral, but the results are anything but.

1
Congress.gov. Statutory Interpretation: Theories, Tools, and Trends
2
Constitution Annotated. Constitution of the United States – Eighth Amendment
3
Constitution Annotated. Intro.8.3 Original Meaning and Constitutional Interpretation
4
Justia. Church of the Holy Trinity v. United States, 143 U.S. 457 (1892)
5
Justia. Trop v. Dulles, 356 U.S. 86 (1958)
6
Justia. Obergefell v. Hodges, 576 U.S. 644 (2015)
7
Constitution Annotated. Intro.8.8 Structuralism and Constitutional Interpretation
8
Constitution Annotated. ArtI.S8.C18.3 Necessary and Proper Clause Early Doctrine and McCulloch v. Maryland
9
Constitution Annotated. ArtIII.S2.C1.10.1 Overview of Constitutional Avoidance Doctrine
10
Constitution Annotated. ArtIII.S1.7.2.2 Stare Decisis Doctrine Generally
11
Justia. Seminole Tribe of Florida v. Florida, 517 U.S. 44 (1996)