Is there a reason you left out the option of supporting/accepting same-sex civil unions but not same-sex marriage, or any other intermediate opinion between "accept all" and "oppose all"?

Well, mostly that I don't think anyone except members of a particular religion have the right to tell members of that religion how to practice it, and I believe there are a number of religions (e.g., Reconstructionist Judaism) which practice same-sex marriage. The only real question is whether these religious marriages (currently illegal in many states) should or should not be linked to law.

ETA clarity.