Christians and gay marriage

I believe that we will eventually prevail on same-sex marriage in the U.S. I also believe that once that happens, Christians will engage in one of their favorite hobbies, rewriting history, to say that they were always on the side of same-sex marriage, just as today they say that they were always against slavery and segregation. Then they will no doubt say how offensive it is to compare gay rights with rights for whomever they hate then.