Such a law would be completely unconstitutional and I would be incredibly opposed to government meddling in the religious institution of marriage.
But, if the law wants to recognize such unions - then I have no problem with that. Along with that, they get the marriage penalty tax, alimony, child custody battles, child support, etc
The old adage comes to mind-"Be careful what you wish for."
Rightly so. How about government meddling in the secular institution of marriage?