I'm of the opinion that these kind of tactics probably aren't as effective as simply what I suggest: "letting the old people die". It's been shown that young people hugely disproportionatly support gay marriage, and support for Prop 8 is declining by a large percentage every year.
I think that when you decide that certain viewpoints or groups are just not allowable at all, all you do is marginalize those groups and push them even further to the extreme. I think you could make a case that Fox News et al would possibly be less extreme if the progressive movement wasn't so vocal about eradicating all potential opposition.
Just my two cents. I'd be really interested to hear other's thoughts on this subject, because I think that bigotry is tied to a whole bunch of other related problems that need solving.