Why did it fail in the first place.
Prop 8 proponents reached out heavily to minorities who otherwise vote Democrat. They were advertising on progressive radio for example with a voice which had a slight latina accent. And of course it was all lies about teaching gay sex to little kids and other such crap. The no on 8 folks on the other hand didn't bother with that and just assumed just because they voted Democrat, they would vote for gay marriage as well. Big mistake since I think young latinos, those who would have young kids, are a key swing demographic on this issue.