Government (any branch) has no business defining marriage.
Marriage is not an issue of race.
Irrelevant. There were laws prohibiting interracial marriage illegally and SCOTUS did away with them. We definitely agree this is a good thing, yet you are trying to frame it as if we disagree.
It most certainly is relevant as I am framing it within the same context to demonstrate your errant take on framing as an issue of race, rather than government overreach (which it also happens to be).
Don't you think that having a law that prevents two people of differing skin colors to marry would amount to government overreach?
The fact of the matter, whether you like it or not, marriage is a 'legal' thing. And, like it or not, marriage is a legal entity under State and Federal government. Whether it should be or shouldn't be is neither here nor there. So as such, in the reality we live, all efforts should be made for such a legal arrangement to be equal and accessible, without discrimination regarding the amount of melanin a couple may possess.
As an aside, can you name a country, territory, locality, commune, or whatever, that has successfully prospered under only "self-rule"? How would "self-rule" work in America?