“For security agst. oppression from abroad we look to the sovereign power of the U. S. to be exerted according to the compact of union; for security agst. oppression from within, or domestic oppression, we look to the sovereign power of the State. Now all sovereigns are equal; the sovereignty of the State is equal to that of the Union, for the sovereignty of each is but a moral person. That of the State and that of the- Union are each a moral person, and in that respect precisely equal,”
http://www.founding.com/founders_library/pageID.2212/default.asp
