The ''' Plurality opinion''' is the opinion supported by three of four [[justices]], that the decision, but not the legal reasoning, is supported by a majority.
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The '''Plurality opinion''' is the opinion supported by the majority of [[justices]] that agree to the decision but when not all of the supporting justices agree with the legal reasoning behind it.
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It is the controlling opinion when no majority opinion exists such as in the case of [[Planned Parenthood v. Casey]] <ref>http://www.prochoice.org/policy/get_informed_active/glossary.html#plurality</ref>