That's true. It would put yet another instutution of the state under the Federal umbrella, where the FedGov is already having trouble funding much of its activity because it is doing too much such as warring with islamics and rebuilding New Orleans at the same time, as well as going to the moon and sitting on vast mineral and other economic deposits.
This is an extremely important and necessary step by the feds because if the courts continue unchecked all others will see a loss of their constitutional rights such as fredom of religion, speech and association.
Marriage, in the government's eyes, has never had anything to do with love, it has had everything to do with building society. Children are best off in a two parent home, they end up costing the less, to the state, if they are raised this way. That's why the government has anything to do with marriage. And that's why the government should conitnue to reward those couples.