Agreed. But should Texas, e.g., have to recognize a same-sex marriage performed in Massachusetts?
Unless the Federal government issues a standard definition of marriage (see mnehring's #793), they do -- under the "full faith & credit" clause.
We don't, but we sure have had our share of gays married in other states, to include transgendered ones, trying to get divorces in TX...to in effect set a precedent to force us to recognize gay marriages from other states.