The Constitution does not address marriage, therefore, it is left to the states to deal with. Federal control or input into marriage is unconstitutional. Why is the government involved in marriage? It is a private contract between two people. The act of state licensing equates to government permission to marry. Is marriage a privilege granted by the state?

The elimination of government licensing of marriages at the state level nullifies federal meddling.

Tenth Amendment Center Archives: Marriage

Social Engineers in Black Robes – the Intellectual Dishonesty of Ginsburg, Breyer, Kennedy, Sotomayor, and Kagan
To gain an understanding of just how openly defiant the five liberal Supreme Court Justices are of their oath of office to “support and defend the Constitution” consider this:

In 2013, the federal Defense of Marriage Act was struck down by a 5-4 vote by the Supreme Court. The five votes came from Ruth Ginsburg, Stephen Breyer, Anthony Kennedy, Sonia Sotomayor, and Elena Kagan. The primary reason given in their opinion for striking down the law was because MARRIAGE IS A STATE ISSUE, not an issue to be influenced by the federal government. . . . . . . . .