Oregon passed a such a constitutional amendment. The libs then created civil unions, making all marraige laws applicable to civil unions. The liberal attitude is "Voters be damned". We are losing the battle, but we'll win the war. Remember, when the tribulation period comes, it will be because the world deserves it.
The great thing about the Texas marriage amendment was that it not only prohibited state recognition of "gay marriages", but it also prohibited recogintion of any thing like "civil unions" that resemble the legal status of marriage. It also prohibited any other unit of government within the state from recognizing or recording either "gay marriages" or "civil unions". This of course was targeted at Travis county to prevent them from giving employment benefits to the "significant others" of unmarried public sector employees.