They asked the Justice Department about DOMA's constitutionality because they wanted to do the right thing. Don't you think Vice President Biden acted in good faith, when he voted to enact DOMA?They knew the answer then, you dolt. DOMA was a slick (yet heinous) political maneuver to out-flank a Constitutional Amendment movement. Hawaii almost legalized gay marriage and Congress had a hissy fit. It will have been SO much easier to overturn DOMA than to repeal a Constitutional Amendment. Most of those politicians were lawyers... they knew damn well the federal government has no business passing a FEDERAL law codifiying marriage discrimination into law. It bought them time. Looks like you'll need a few more decades for you to adapt.
BTW, each time the Justice Department replied DOMA is constitutional.