This summer, in United States v. Windsor, 570 U.S. ___, 133 S. Ct. 2675 (2013), the U.S. Supreme Court found Section 3 of the Defense of Marriage Act (DOMA) unconstitutional. From now on, the federal government cannot treat same-sex marriages differently from heterosexual marriages. The states still may. But for how long?

Imagine this scenario: Two newly married—and even newer—residents to Georgia, show up at a Department of Driver Services customer service center to apply for driver's licenses, using their new married surnames. The first, a young lady named Alice, presents a marriage license from Vermont announcing her matrimony to someone, first name Gunter (or Wolf or Spartacus). The second person, Robert, presents a marriage license from Vermont announcing his nuptials to someone named Gunter (or Wolf or Spartacus). Besides the names, nothing indicates gender on either marriage certificate.