You seem to be either implying or assuming that not supporting gay marriage necessarily means believing homosexuality is wrong, but in my experience, that is false and only the converse is true. The people I know who don't support gay marriage have no problem with homosexuality or homosexual people (that is, they have no problem with people identifying as gay nor having gay sex), they just believe that allowing gay marriage would be redefining "marriage". (Which I believe is a bigoted opinion, but I am sympathetic to their ignorance and fear.)
I don't believe this is sampling bias on my part; in fact, I thought that was exactly the position on gay marriage taken up by both Obama and McCain in 2008, I specifically remember there was some debate or joint interview or something where Obama opened by strongly asserting that gay people deserve all the same rights, and McCain opened by strongly asserting that he doesn't believe in "redefining marriage", and they proceed to find that they completely agree with each other.
I don't believe this is sampling bias on my part; in fact, I thought that was exactly the position on gay marriage taken up by both Obama and McCain in 2008, I specifically remember there was some debate or joint interview or something where Obama opened by strongly asserting that gay people deserve all the same rights, and McCain opened by strongly asserting that he doesn't believe in "redefining marriage", and they proceed to find that they completely agree with each other.