I would say the last few years the dominating trend has been in favor of Gay Marriage
Public opinion of same-sex marriage in the United States - Wikipedia, the free encyclopedia

Most polls nationwide are in favor of some form of legalizing gay marriage. I wouldnt classify it as normal in terms that normal sexual activity from all beings is usually male and female. Species of the same sex do have sexual activity with each other, and theres records of that going back to the beginning of time.

I would disagree with Blanks notion that it is the same as Racism. Sexual orientation is not the same as racial injustice. No one is refusing gay people any rights(they can still get married in several states). No one is forcing them to sit at the back of the bus, drink from different water fountain, etc.