The US is not ready for a Gay President yet.
It is possible James Buchanan, the bachelor president prior to Lincoln, was gay. He is consistently rated by historians as one of the worst presidents.
Please don't do this. That is what the Leftists do, apply weak 21st Century morals and values on those from past centuries. Sir Henry Morton Stanley never consummated his marriage but that didn't make him gay. James Buchanan lived his life in the Romantic Era where even if there was an affection for another, it was more noble and heroic to not have a physical relationship.