"But I do think it often works with more casual homophobes, just as it often works with people who are prejudiced against others because of race.
I've known that to be the case in my own life."
As have I. This is probably not the best analogy, but my great grandma who paassed away about 10 years ago at the age of 103 was a casual, yet still strong, racist. I grew up just kinda wincing and ignoring her casual remarks about "those chinks", and blaming them for everyone (where we grew up, the only real non-white population was Asian). The last decade of her life, she ended up, much to her protest, with a nurse who had just moved to Canada from Hong Kong. You saw the progression--at first she would kinda imply that her nurse (who she quickly grew to love) was merely a rare exception, but gradually her whole attitude seemed to change.
Many have pointed out that despite the youth bullying, younger generations in the US are much more open to gay marriage and equal rights than older ones. And really most of that just comes from exposure. Shows like Will and Grace may not be the best role models, I suppose, but every little thing like that does make a difference.
Phyllis linked the NYT piece by the guy who chaired the debate, and I agree nearly completely with whathe said. But that piece had a link to a piece by Mr. Browns former ally, David Blankenhorn, the founder of the Institute for American Values, who HAS changed his stance on gay marriage. He hasn't done a complete turn around (and unlike Brown, his focus, one I don't fully agree on but do have more respect for, is on the importance for society and children of *marriage* in any form, not of using it as an excuse to preach the bible), but he has changed his stance. And actually he mentions that part of the reasoning is you simply do have to give in to some of the positive changes of the time, that you can see with youth's attitude, etc.
http://www.nytimes.com/2012/06/23/opinion/how-my-view-on-gay-marriage-changed.html