As people from all sides of the fence try to handicap the outcome of the two marriage equality cases the Supreme Court has agreed to hear, even virulently anti-gay Maggie Gallagher, the first leader of the National Organization for Marriage, thinks DOMA is going to be overturned:
I think Kennedy will overturn DOMA (perhaps joined by Roberts) and then uphold the right of states to refuse to accept gay marriage (i.e. uphold Prop 8).
The victories this November for gay marriage at the polls make that outcome more likely. Justice Kennedy will likely see it as not at all unlikely voters will overturn Prop 8 soon and see that as a much better outcome than constitutionalizing gay marriage.