They are clearly dropping any pretense that it is about “gay rights” since nobody would ever considered it a “right” to have their union forcibly defined for them. It is now about getting the state’s citizens to enthusiastically accept being shackled.
That said, it may be time for the red states to just rely on the 10th Amendment when it comes to relationships between the feds and states. They should probably say that if the coastal states want to go full totalitarian and leave American values behind entirely, then let them make their bed and lie in it.
This is the logical conclusion when the State gets into the business of defining what is or is not a marriage.