Full Faith and Credit, GLBT Marriage?

Full Faith and Credit doesn't require states to honor each other's marriages. The Supreme Court has never said that one state can overrule the laws of another state. If you are in one state, you are subject to the laws of that state, and you can't say that because you are from somewhere else the local laws shouldn't apply to you. Full Faith and Credit basically means that a state should not question the validity of a law or proceeding from another state, but that does not mean that they have to adopt the same law in their state.