Here's what I wrote on the subject some months ago, on my "About Me" page. I still stand by today what I wrote then:
Barring significant constitutional changes, I think legalization of gay marriage is likely inevitable. I opposed Proposition 8. I believe that we live in a secular republic whose laws will sometimes contradict religious teachings, and unless we want to live in a theocracy (I don't) we have to accept that.
My personal preference would be for the government to get out of the marriage business altogether, and let churches, mosques, synagogues, temples, etc. decide which marriages to sanction. Perhaps this will spur some kind of change along those lines. We shall see.