The scheduled debates don't invite everyone. Just the top 4 or 5, I think. That will help thin out the herd. As for the general election, I think most Republicans, Tea party, Libertarians, don't want another 4 years of Obama in disguise. I think we'll still have the turn out. I think the problem is going to be the Dems suing a bunch of states for requiring a photo ID to vote.
As for debate topics, while gun control is extremely important, I think general safety, government entitlements and the economy are what most people are worried about. I haven't updated the PopVOx page in a while, I've been extremely busy with school and I really dislike their new format, but check out the website and let your congressmen know. I usually hear back from one of my senators regularly.