If I recall, Card is a liberaltarian.
Thus, I don’t expect much defense of social conservative issues from him, except to the extent that they distort his storyline and plot.
He’s a Democrat that sounds more like a Republican. A couple of his articles have been posted on here, so you can check for yourself.
He self-describes as a Dem. I'd call him a Conservative Christian Democrat. That makes him a pretty rare breed of cat, IMHO.
And FWIW, I've not read Ender's Game. I've tried to read a couple of his other books (don't remember the titles, they were so unremarkable) and I thought they were pretty much unreadable. Came across sort of like a Tom Clancy-lite, without the character development and plot.