Realized I didn't know what a narrow ruling on DOMA would be. The Prop 8 case is really where the 'marriage as Constituional right' comes up – DOMA is more about equal protection clause. A narrow DOMA ruling would be: "The Court could write the decision narrowly- opening federal benefits to married gay couples but not broadly addressing the question of marriage as a fundamental right." http://nymag.com/daily/intelligencer/2013/03/supreme-court-gay-marriage-primer-prop-8-doma.html
Arguments start today; get familiar.