But voting 3rd party doesn't do that. Do you think Democrats or Republicans look at the 2% the 3rd party candidate received and go, "Holy crap, people are fed up with us!" No, because it doesn't affect them at all. The reason 3rd party candidates are ignored in this country is because they're either completely bat-shit crazy, or because they have zero qualifications to run.
The problem isn't that we have a two party system. The problem is that the independent parties are so bad at getting their word out and starting an actual movement that no one takes them seriously. The presidential race certainly isn't the time to be doing it, because they're just pissing in the wind at that point.
Sports analogy time: A 3rd party candidate running for president is like your local flag football team going to play in the Super Bowl. You don't have the support, the experience, nor are you at all prepared for it. You're going to lose, and lose badly, and all you're really doing in the process is making a joke of yourself. To get to that level, just like running for president, you need to start from the ground and work your way up. If the Green party and Libertarians want so badly to play in the big leagues, they need to start winning state and local elections. They need to start getting people in the state and federal legislatures. They need to make their name and their brand known to the wider public as a viable, serious option.
Right now, all Jill Stein and Gary Johnson are doing is stroking their own egos. They don't care about the direction of this country, and they certainly don't care if they end up being partially responsible for election of the worst candidate in American history. All they care about is their own selfish needs and agenda, and rage at people who call their validity into question. They're both absolute quacks who are in this for themselves, and voting for them doesn't send a message to anyone except to fuel their delusions that anyone is making a difference. Voting 3rd party doesn't make you ideologically pure, it doesn't convey meaning or gravitas. You may as well skip voting for president at all.