As we get near a tipping point, this becomes even more important.
If nothing else, it will make independents sit up and take notice as they see that gays are being more Christian than the self-proclaimed advocates for Jesus. That always makes people re-evaluate (it sure did when I was in high school, helping fight the dress code, which the administration claimed was necessary because we kids didn't know how to dress appropriately for various occasions -- but at the school board meeting, all our student speakers were in good formal garb perfectly fine for a corporate business meeting, while the administration people showed up in casual clothes... we'd won the moment our first speaker stood up and peoples eyes went from one set of representatives to the other).
As with Ghandi's fight, this is to a large extent about civilization. The contention of one side is that if we are allowed to flourish, civilization is doomed. The best argument we can make against that is to be more civilized than they are -- admittedly not hard, if you look at the extreme examples, but what has to be aimed for is the overall impression. When people think of Republicans, a great many have the image of respectable business folks; when they think of gays, what image comes to mind? We need it to be at least as respectable as those businessmen -- and far, far, far more respectable than Bachman and others.
Another way to put it is that we have to look like the grownups, so that people see that if anyone is a threat to civilization, it's the reactionary theocrats, not those merely wanting what the Founding Fathers expounded.