The lawyer explicitly identifies morality itself as the target of the lawsuit:
The exact legal arguments for same-sex marriage equally apply to multiple-person marriages. Turley acknowledges that marriage laws that do not include both are “a tool for the imposition of a uniform moral agenda or tenets on citizens.”
I don’t know whether he understands that the argument “we ought not to impose morality on others” is a contradiction, but he might. The ethic of the ubermensch is that those with sufficient power will impose their vision on others, and morality has nothing to say.
As we shall see.