The Constitution sets limits on the powers of the federal government, as well as its responsibilities and powers.
Many of the state constitutions, like Indiana, further restrict the allowed behavior of the state.
Strictly speaking, states don't issue marriages, they issue marriage licenses, and only has effect for legal or statutory reasons (like taxes, inheritance), as well as anyone who asks for such a marriage license when doing so is lawful. So I'm not sure what point you're getting at.
I'll repeat my question: You're comfortable with compelling a Jewish bakery to cater food for neo-nazis, under threat of fine and/or prison?