I think there was a tipping point with Obama. It’s a negative until masses actually start to realize that there’s a chance and then in the end I think it became a positive down the stretch. Hard to picture a gay candidate getting to that level of positive down the stretch, but as the father of a gay son, I really hope I’m wrong or that we get there. Not that I think he’d be POTUS, but I’m all for knocking down barriers.I just don't think it's a significant negative. Could be a negative, but not something that couldn't be overcome.
Sort of like Obama being black. People were saying the same thing about being black. And it probably was a negative. (possibility it wasn't, technically) But it didn't prove to be one that couldn't be overcome easily enough with an otherwise good candidate.
Size of effect.