And some people here consider him the “soul of conservatism”!
Indeed I do.
The powers delegated by the proposed Constitution to the federal government, are few and defined. Those which are to remain in the State governments are numerous and indefinite. The former will be exercised principally on external objects, as war, peace, negotiation, and foreign commerce; with which last the power of taxation will, for the most part, be connected. The powers reserved to the several States will extend to all the objects which, in the ordinary course of affairs, concern the lives, liberties, and properties of the people, and the internal order, improvement, and prosperity of the State.--Federalist 45
I know some of these ideas come as foreign to those that play at federalism, but marriage falls under 'lives, liberties, and properties of the people'. It is an institution that is recognized by the separate and sovereign states and not something intended to be a federal matter.