Michael W. McConnell (Stanford Law School) has posted
Natural Rights and the Ninth Amendment: How Does Lockean Legal Theory Assist in Interpretation? (New York University Journal of Law & Liberty, Vol. 5, 2010) on SSRN. Here is the abstract:
Some of the most contested questions for modern constitutional law stem from the decision of the First Congress to enumerate some – but necessarily not all – fundamental rights as part of our basic legal framework. Lockean social compact theory can help us to understand these provisions of the Constitution, and especially the Ninth and Tenth Amendments.
Highly recommended.