In his book, America’s Unwritten Constitution, Akhil Reed Amar contends that to properly engage the written Constitution, scholars and laymen alike must look to extratextual sources: among them America’s founding documents, institutional practices, and ethos, all of which constitute Amar’s “unwritten Constitution.” In this Article, I argue that contemporary originalist constitutional theory is consistent with reliance on extraconstitutional sources in certain circumstances. I establish a framework for revaluating the use of extratextual sources. That framework categorizes extratextual sources and explains their relevance to constitutional interpretation (the meaning of the text) and constitutional construction (elaboration of constitutional doctrine and decision of constitutional cases). I conclude by applying the framework to a question posed by Akhil Amar: Can vice presidents preside over their own trial upon impeachment? A negative answer to this question is consistent with an originalist constitutional theory that carefully cabins the use of extratextual sources in constitutional interpretation and construction.
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