So it seems that people are expecting that the part of DOMA that deals with federal recognition of same sex marriages to be struck down, while the part that deals with states recognizing out of state marriages to be retained. There's definitely a state's rights argument there, but "state's rights" is normally only used to help conservatives.
It's a little less sure whether Prop. 8 will be struck down, but most are assuming that it will. Obviously that is not "state's rights", even though the state as a whole wouldn't mind that they wouldn't have to wait until November 2014 to legalize it by initiative.
That's because only the provision dealing with federal recognition is up for debate in this case. The Supreme Court isn't allowed to rule on the other DOMA provision, on recognition by other states. It's only the federal part that's up for debate in this ruling.