A state by state referendum, Choose either A or B:
A) People will only be allowed to marry other people of the same sex, or
B) The state will sanction no marriages whatsoever, leaving that business to religious groups, sects and cults, or self-defined communities of friends and comrades.
Basic rights (including the right to decent health care) and full recognition of one’s humanity do not depend on one’s marital status.
ps: Only GLBTQ people shall be allowed to enlist in the military. Keep it simple.