While I agree and support that all couples regardless of gender should be afforded the same rights, responsibilities, privileges etc, I do not think it is the gubments job to define or otherwise rule on what marriage is. In my opinion gubment should recognize civil unions for all and mandate that all entities that confer benefits on couples not discriminate based on the gender of the couples. That is what people can and will agree on. But when you have some people up there continuing to call it 'marriage' and equating it with civil rights, it alienates a whole group of people.
When people start equating the civil rights movement and treatment of minorities/indigenous peoples with the right to marry, they totally lose my vote. Last I checked the definition of marriage did not stop someone from voting, obtaining a job, moved to a reservation, lynched, or legally prevented from living their lives.
Personally I think the No on 8 people got caught sleeping. They lost the political battle due to arrogance, poor planning, and poor PR. And if the No on 8 people keep throwing in my face that this is like the civil rights movement, I may just totally ignore them. Have them give a compelling argument akin to my second paragraph and I will agree with them and vote to support the cause.
Just my 02.