Talk about "single-issue" voters. If it's extreme to prioritize voting because of abortion, how much more extreme is it to do so over same-sex marriage, since it comparatively affects the rigts of so few people, and with much less impact. I think if I had my choice between not having the right to marry and not having the right to live or even be considered of having any worth at all, I would choose the former.
The "bigots" who oppose same-sex marriage do so because of a desire to protect an institution, not because they are "anti-gay." But why do the same people who desire these special rights scream so loudly to deny the most basic right of 1,000,000 human beings every year? Apparently they care only about the rights of those who can vote. If the Republicans are appealing to the "bigots," I think a case could be made the Democrats are appealing to the "baby-killers," but I think it's not very polite to say either, since it denies the intention behind the position. See how that works? (No, I don't think so).
But since the enconomy is a horror, I think neither social issue will be on the top of the list for most voters.