Nelson Lund (George Mason University School of Law) has posted Same-Sex Marriage in the Courts of Law and Reason (Engage: The Journal of the Federalist Society's Practice Groups, Vol. 14, No. 1, pp. 34-35, February 2013) on SSRN. Here is the abstract:
This symposium contribution very succinctly summarizes the principal arguments for concluding that the Constitution does not require governments to recognize same-sex marriages.