Sorry Jeb. God beat you and the states to it, when He created, defined, and instituted marriage at the beginning of the creation.
He did, but he didn't give tax breaks and other such governmental nonsense -when the government got involved, it was only a matter of time before the inevitable happened.
Being as how we live under the Constitution as far as how power was supposed to be distributed, the States make sense - many have tried to stop it and were overridden by the Federal "courts".
Much would be a lot closer to God's Will if the States insisted on their 10th Amendment rights and told the Feds to cram it....