Show me where Trump specifically said he supported homo marriage. Yes he did say marriage should be left to the states. He also said once the Supreme Court had ruled on it, but he also said his personal definition was what it always was,
First hit I got on DuckDuckGo...
I’m sure there are more. Perhaps “support” is the wrong word, more like, it is what it is. Remember, he was not a Politician.
What sets him apart from Clinton, Obama and Biden is they were publicly against Gay Marriage before they were for it.
https://www.nytimes.com/2016/04/23/us/politics/donald-trump-gay-rights.html