We need people who are like us in office. Homosexuals are not like us. They should be tolerated at best, and even that is a stretch.
My worry is that a gay president would have more allegiance to the gay "community" rather than traditional families and values. And, he might want to make American into a large San Fransicko.
I also worry that a gay president would not be held to the same levels of responsibility that would, say, a Donald Trump or the Bushes, and that the gay president would take full advantage of the latitude.