"A woman is like a teabag, you never know how strong she is until she gets in hot water." - Eleanor Roosevelt
Keep your religion out of other people's marriages.
Setting aside the fact that I obviously don't like slavery and do think freedom of contract is important such that I don't really care if seventeen folks want to get "married," regardless of who's having sex with whom...Dred Scott was just a terrible decision. the fourteenth amendment came after that.
On the level of what it does regarding the Constitution, this is no different from and no better than Dred Scott.