DHS FAQs on the effect of the Supreme Court’s ruling that Section 3 of DOMA is unconstitutional. USCs and LPRs in same-sex marriages can now sponsor their spouses for immigrant visas. In evaluating the petition, USCIS will generally look to the law of the place where the marriage took place.
http://www.dhs.gov/topic/implementation-supreme-court-ruling-defense-marriage-act
