Taxing a business based on its employing one full-time employee in the taxing state does not violate the Due Process Clause.

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How can the due process clause he cited--"nor shall any State deprive any person of life, liberty, or property, without due process of law"--be used to create a new "right" out of whole cloth?

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Further claims could be based on the dormant commerce clause, Substantive Due Process, or the Equal Protection Clause.

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His favourite clause of the constitution was the 14th amendment, which guarantees due process and equal protection of the laws.

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