Gay couples in Mass. look here

It's now your chance to make history. The 9th Circuit dismissed the case to challenge the federal DOMA, because that California couple doesn't have standing on this issue

A federal appeals court today dismissed a challenge by two Orange County men to a law denying federal marriage benefits to same-sex couples, saying a couple that isn't legally married under state law has no right to contest the federal definition of marriage.

And I do think they are right. You have standing on this only if you're legally married, say in Mass., then you filed for join tax return, and got rejected by IRS. BTW I found "lack of standing" the easiest way to avoid difficult constitutional issues.