Today's Milwaukee Journal Sentinel has an article addressing the "uncertain" effects of the marriage amendment and it is a case study in the "he said, she said" method of reportage. Nothing wrong with that and the reporter does a good job of reciting the opposing arguments, but isn't there an obvious point that needs to be made in response to the point, made in the article by Sen. Jon Richards, that the "second clause that goes way beyond marriage, goes beyond to civil unions, health benefits, even (the right of) a person to visit their partner in the hospital."
It does go to civil unions (a status that doesn't really exist today), but here's the biggest point on the claim that the amendment will preclude the conferral of benefits, keep people from visiting their partners in the hospital, etc.
Twenty states have marriage amendments. In all of this states there is not one instance - not one - of an amendment being interpreted to preclude these things.
Utah has a marriage amendment. Salt Lake City has a benefits plan in which employees who are unmarried may designate an adult dependent residing in his or her household to be covered by the employee's health insurance and other benefits. When Salt Lake adopted this program (expanding it from one that required the employee and co-beneficiary to be in a sexual relationship), the Alliance Defense Fund withdrew its objection. Someone else continued the case, but they lost.
As the article points out, after the amendment passed in Michigan, someone challenged a domestic partner benefits plan offered by the Ann Arbor schools. While the matter is being appealed, the plaintiffs lost. The trial judge upheld the benefits notwithstanding the amendment.
The worst case that Fair Wisconsin can trot out is the refusal of two Ohio appellate courts (out of ten that have addressed the issue) to apply that state's domestic violence law to unmarried couples. (Of course, the perp can still be charged with assault and battery.) My guess is that the Ohio Supreme Court will side with the 80% of lower courts that have held the amendment doesn't affect the domestic violence statute, but the larger point is that, in Ohio, the pertinent part of the domestic violence statute applies only to people who are or have lived together "as spouses." Wisconsin law does not require that. It applies to any adults living in the same household.
Amendment opponents argue that we should ignore actual results in other states imposing same sex marriage and yet be scared to death of possible arguments that have been rejected everywhere they have been tried.