Why do you feel like "Gamergate" is worthy of additional mainstream news coverage? Mainstream news is an entertainment product more than anything else, and few people who watch / read it religiously are likely to be both heavily involved in gaming and passionate about the range of issues Gamergate purports to cover. It makes sense that it's more of a footnote or focuses more on the side that's likely to be of interest to a wider audience.
Discussions of the Gamergate issue haven't proven productive in any venue thus far, as they're often dominated by mistruths, irrelevant information, lies, and harassment. I usually avoid voluntarily exposing myself to it because I have no way of determining who is being truthful without significant investigation, and I frankly don't care enough to spend the time looking into the various claims; I suspect that's true of many people.
Let's be a bit more frank here, the movement has something in common with religion: its goals are so vague that the people who are trying to do 'good' and improve things are sheltering those who want to cause destruction. There is a significant vocal minority who are using the shield of the many moderates to justify their extremist tactics, which seem to revolve around harassment campaigns. When this happens to your movement you can either try to correct it or disassociate yourself from it and re-form in a more focused group. I suggest the latter is more likely to work at this point, it seems like it would be quite hard to drown out the vitriol I've seen without even trying to look for it.
You should really look into dropping Gamergate entirely, to divest yourself of its now relatively toxic branding, and creating several focused movements to replace it.