I don't think if the candidates were to talk about gay rights it would be a waste of time. Even if you don't agree with them full on what they say, at least the issue gets out there to a general audience and is talked about.
It would get the issue out there, but would it go further than it already has in American political culture?
Neither candidate supports gay marriage. Both Democrats are trying to have it both ways on gay marriage by saying they don't support full marriage rights to gays but they are against bills which would limit their rights. That's the same position Kerry and Edwards took in 2004. Meanwhile, McCain used to think gay marriage should be left to the states, but I'm assuming that position has changed since he became the Republican nominee.
Marriage doesn't even begin to dig into the numerous other issues facing homosexuals. Both Obama and Clinton have given standard answers to concerns such as gay adoption and openly serving in the military. "We want gays to adopt"-- How? "We want gays to serve in the military"-- Does that include repealing DADT? Maybe?
Clinton has said she supports repealing DADT, Obama said he would "consider" it. Excellent. That's what Kerry said in 2004, so he could have it both ways too. Apparently, staying in the middle on issues you can't have a middle-ground stance on is the way to go. That's how you convince bigots in Missouri that you may be against the gays, while also convincing queers in San Francisco that you'll cater specifically to them. Great.
All Obama talks about is including gays in hate crimes legislation, and repealing DOMA-- which every Democratic candidate supports, including the wife of the man who passed it.
Then he has the nerve to say "we must address the HIV/ AIDS epidemic," as if that's
the issue facing the gay community. He'd be right, if he were running for President twenty years ago. Now it's about marriage equality, workplace equality, and being able to live and raise a family without being crapped on by the federal government. And because Obama doesn't support marriage equality, it's quite evident that he can't be the leader the gay community has been looking for.
So while in an ideal universe, a debate on gay rights would be appreciated, there's really no reason to have one, considering
every answer the politicians give will be the same crap we've heard in the past.