[DarkSavant]

I don't see how this is a potential lawsuit. The Federal Government already treats it's own employees differently depending on states they live, including employee compensation. The thought is services and benefits in the Federal level with marriage clauses will use contractual language that does not include marriage.

If State Y defines a marriage a certain way, it's not relevant to employee benefits. The Feds see will word the benefit as a civil contract that isn't privy to an individuals state's definition of marriage.

[Beagle8U]

If the Feds accept queer marriage but some states don't, the queers will get married in queer states and go back to normal states to live.

How the hell would they file taxes? Married on Fed forms and single on state?

There are millions of laws on the books that would have to be changed.