[P-Marlowe]

Congress has to pass a law defining marriage

They have no jurisdiction in that area. They can't define marriage for the states. But then neither can the SCOTUS.

[Cold Heat]

If Congress doubled down on the BS scotus interpretation of the 14th, then they could make law on marriage for the states...but I am not sure we should go there. We need Congress to regulate the court and vacate this and other decisions..

[Captain Compassion]

Exactly. The courts have invalidated marriage laws for all states. Any attempt by any state to try and enact new marriage laws will be subject to federal review. Even disregarding same sex marriage there are other differences between state laws that aren't equal. In some states you can marry at 16. Other states it is 18. How long before two 17 year olds sue the state of California for the right to marry? Multiple marriage issues are soon to appear in court.