The problem is that the what the Constitution say has too often become what libs want it to say.
That's where state nullification comes in. Where there is a genuine controversy about a federal law being constitutional, the state must make a good-faith effort to read the text in the original understanding and intent.
Here with marriage, it should not be a close call. The state could nullify pending a possible attempt to have the feds reconsider the act and repeal it themselves.
At this point the most important thing is to get state involved in this valid, constitutional process.