Introduction
The world of contemporary constitutional theory is complicated. Although originalism the focus of attention in many recent discussions, there are a plethora of nonoriginalist positions. One of these is usually called “constitutional pluralism,” an approach to constitutional interpretation and construction which holds that constitutional practice should be guided by multiple “modalities” of constitutional justification, including text, historical practice, precedent, and others. This Lexicon post provides an introduction to constitutional pluralism for law students (especially first year law students) with an interest in constitutional law.
Constitutional Law as a Complex Argumentative Practice
Constitutional pluralism can be theorized in several ways, but for the present purposes, let us stipulate that constitutional law ought to be viewed as a complex argumentative practice. When a judge decides a case, the judge ought to justify their decision by employing the legitimate forms of constitutional justification, and should exclude other considerations.
So, a judge may properly consider the meaning of the constitutional text and precedent and write an opinion that justifies their decision on the basis of those two modalities but it would be improper to consider the impact of the decision on the electoral success of a political party or the benefits of the decision for a special interest group.
Importantly, constitutional pluralism is grounded on the idea that constitutional law is a practice–a way of doing things with an internal logic and structure. Frequently, constitutional pluralists claim that this account of constitutional law is descriptively accurate. Constitutional pluralism is the way lawyers and judges actually do constitutional law. This strategy avoids or brackets another set of issues about the normative justification for pluralism. In other words, some constitutional pluralists believe that constitutional pluralism is just the way we already do constitutional law and avoid the question whether the status quo is normatively justified.
What are the modalities of constitutional justification?
There is no “official” list of the legitimate forms of constitutional argument. Different pluralists have different lists. For illustrative purposes, I will employ five modalties, which I will call (1) text, (2) historical practice, (3) precedent, (4) constitutional values, and (5) institutional capacities. But additional modalities could be added to the list, including “structure,” “policy consequences,” “morality,” “constitutional narratives,” and “constitutional identity.” I will briefly discuss these possible additions to the list.
Text: Constitutional arguments are legitimate if they justify constitutional doctrines and decisions on the basis of meaning of the constitutional text. Thus, it would be legitimate to argument for a constitutional rule that extends birthright citizenship to the American born children of undocumented parents on the ground that the text of the first clause of Section One of the Fourteenth Amendment requires that result. Arguments from original public meaning would be textualist arguments, but a constitutional pluralist might also make arguments from the contemporary meaning of the text.
Historical Practice: Constitutional arguments are legitimate if they justify constitutional doctrines and decisions on the basis of historical practice, including statutes enacted by Congress, actions of the executive branch, and actions by state governments. Thus, if Congress has enacted many statutes delegated legislative power to independent regulatory agencies over a long period of time, that would constitute a strong argument for the constitutionality of that practice and against a strong version of the nondelegation doctrine.
Precedent: Constitutional arguments are legitimate if they justify constitutional doctrines and decisions of the basis of precedent including (but not limited to) the decisions of the Supreme Court. Thus, if the Supreme Court has adopted a set of constitutional doctrines in the Noel Canning case, there is an argument from precedent that those doctrines are justified. Arguments from precedent are strongest if there are many precedents extended over a long period of time in favor of a constitutional rule or standard. Such arguments are weakest if there is only precedent, it is very old, and has been undermined (but not not overruled) by subsequent cases.
Constitutional Values: Constitutional arguments are legitimate if they justify constitutional doctrines and decisions on the basis of values that are imminent in constitutional practice, paradigmatically values that express the goals, functions, and justifications for the provisions of the constitutional text. Thus, equality is a constitutional value because it represents the goal of the Equal Protection Clause, and liberty is a constitutional value because protection of Due Process Clause.
Institutional Capacities: Constitutional arguments if the justify constitutional doctrines and decisions on the basis of the functional capacities of constitutional institutions. For example, it could be argued that Congress is the constitutional institution that is best situated to determine whether a given policy question should be resolved by Congress itself, by a regulatory agency, or by the Courts. If this is the case, this argument supports the conclusion that the a delegation of regulatory authority to an agency is constitutional.
Possible Additions to the List: Different pluralists may have different lists of modalities. For example, “structure” is sometimes listed as a modality. I have excluded it, because I believe that constitutional structure arguments can be reduced to textual arguments (implications from the structure of the text) or constitutional values arguments (values that are implicit in the structure of the constitution rather than a particular provision). Other modalities mights include: (1) policy consequences or pragmatism, (2) morality or natural law, (3) constitutional narratives or historical stories about constitutional development, and (4) constitutional identity or arguments from how the American people understand their identities as constituted by the constitution. And there could be other modalities as well.
The Relationships between the Modalities
Conceptually, we can imagine several versions of constitutional pluralism, each with each own account of the relationship between the modalities. Here are some of the possibilities:
The Standard Account, No Hierarchy: The standard account is that all of the modalities equal, independent, and sufficient. They are equal in the sense that there is no hierarchy among the modalities. They are independent in the sense that an argument from one modality (e.g., text) is not required to take into account the other modalities (e.g., precedent). They are sufficient in the sense that a constitutional doctrine can be justified on the basis of any one modality, even if all of the other modalities point the other way. On the standard, account, if a doctrine or decision can be justified by precedent, then the judge can legitimately reach that decision, even if the constitutional text, historical practice, constitutional values, and institutional capacities all point the other way. Indeed, the judge is not required to even consider all the modalities: if precedent supports an outcome, then the judge can stop there. In other words, if the modalities conflict, judges must simply choose an outcome, because pluralism does not tell them what to do on the standard account.
The Balancing Theory, the Modalities Must Be Balanced: A second possible version. of constitutional pluralism would be based on the idea of balancing (in a loose sense). On the balancing theory, a judge ought to consider all of the modalties. If they all support one outcome or doctrine, then the judge must reach that outcome. But if the modalities point in different directions, then they must be balanced. For example, if both precedent and historical practice strongly support one outcome, but the text points in a different direction, then the judge is required to determine the strength of each modality. The judge might conclude that since there are many precedents and a longstanding historical pracitce in favor of one doctrine (say a very weak nondelegation doctrine), the judge may decide that this outweighs the contrary argument from constitutional text.
The Hierarchical Alternative, Lexical Ordering of the Modalities: A third possible version of constitutional pluralism would be based on the idea that there is a lexical ordering of the modalities. For example, the text modality might come first, if the text is clear, then text governs. But if the text is unclear, but there there is a controlling precedent (or set of precedents), then precedent governs. If neither text nor precedent is clear, then a longstanding and consistent historical practice will govern. But if historical practice neither longstanding nor consistent, then constitutional values will be considered. If none of the other modalities resolves the case, then institutional capacity will be decisive. Of course, the hierarchical ordering could be different or more complex.
Constitutional Pluralism and Underdeterminacy
One objection to the standard account of Constitutional Pluralism flows from the fact that it implies that most constitutional questions have many right answers. In other words Constitutional Pluralism leads to the underdeterminacy of constitutional decisionmaking. Indeed, it could be argued that almost all of the most important constitutional questions (federalism, separation of powers, the content of unenumerated constitutional rights, and so forth) can be answered in radically different ways–each of which can be justified using constitutional pluralism.
As a descriptive matter, this underdeterminacy might be counted as a plus factor. If pluralism is a descriptive theory of constitutional law, then it could be argued that pluralism explains why constitutional law is underdeterminate as a matter of fact. But as a normative view, the underdeterminacy of constitutional pluralism might be seen as a negative. It might be argued that constitutional pluralism makes constitutional decisionmaking depend on the political ideologies and moral values of judges (especially Supreme Court Justices).
The underdeterminacy of Constitutional Pluralism entails that it is difficult to evaluate for those who believe that we should evaluate normative constitutional theories on the basis of the outcomes they will produce. Constitutional Pluralism can justify both Roe v. Wade and Dobbs, both Wickard v. Filburn and United States v. Lopez, both Humphrey’s Executor and a decision to overrule that case. Constitutional pluralism opens the door to constitutional outcomes that are conservative, progressive, liberal, and libertarian.
Conclusion
Constitutional Pluralism is one of the most important and influential constitutional theories. One reason for its importance is that captures significant aspects of actual constitutional practice.
Related Lexicon Entries
- Legal Theory Lexicon 016: Positive and Normative Legal Theory
- Legal Theory Lexicon 019: Originalism
- Legal Theory Lexicon 077: Living Constitutionalism
Link to the Most Recente Version of this Lexicon Entry
(First posted on March 1, 2026.)