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A plurality opinion is in certain legal systems the opinion from a group of judges, often in an appellate court, in which no single opinion received the support of a majority of the court. The plurality opinion did not receive the support of more than half the justices, but received more support than any other opinion.
In Marks v. United States, 430 U.S. 188 (1977), the Supreme Court of the United States explained how the holding of a case should be viewed where there is no majority supporting the rationale of any opinion: “When a fragmented Court decides a case and no single rationale explaining the result enjoys the assent of five Justices, the holding of the Court may be viewed as that position taken by those Members who concurred in the judgments on the narrowest grounds.” Marks, 430 U.S. at 193.
That requires lower courts to look at all opinions to determine which is the most narrow compared to others. This opinion will be called the controlling opinion, and can be a mere concurrence, not the plurality.
The Marks Rule has raised the following schools of thought regarding the appropriate basis for determining the holding in such fractured cases: (a) the narrowest analysis essential to the result derived from a combination of all concurring opinions, (Pedcor Mgmt. Co. Welfare Benefit Plan v. Nations Pers. of Tex., Inc., 343 F.3d 355, 358-59 (5th Cir. 2003)); (b) the concurring opinion offering the narrowest rationale, (e.g. Horn v. Thoratec Corp., 376 F.3d 163, 175-76 (3d Cir. 2004)); or (c) only those parts of the concurring opinions which overlap and arrive at the same result. For example, if one follows the first interpretation, then the holding in the case should be viewed as the narrowest rationale supported by all of the concurring opinions read together as though it were a single majority opinion, and where there is a conflict, the opinion based on the narrowest ground governs. Followers of the second rationale would find the concurring opinion offering the narrowest analysis to be the holding. Whereas, under the third interpretation, only the rationale(s) common to all concurring opinions which arrive at the same result(s) (and to the exclusion of all other rationales) is considered the holding.