"In light of DOMA's disregard for state marriage laws..."
You sir are a fool if you believe DOMA is contrary to federalism. DOMA defends federalism by allowing states to choose whether or not to support gay marriage. Without DOMA, only one state has to choose gay marriage and then all others are forced to acknowledge marriages performed by that state. Without DOMA, your tax dollars will go toward supporting Sodomy regardless of where you live.
And if you are so foolish as to believe that homosexuality is inevitable because of polls of the young, then you might as well just give up on everything because young people side with Democrats on all issues. Its a product of the leftist dominated school system.