Whenever anyone brings up the 2-party system we should all mention the optimal solution: Score voting. http://scorevoting.net/

For all this tactical stuff, Nader says Sanders made a mistake by saying he would still support the Democrats over the Republicans if he didn't win. Nader sees it where Sanders puts up a huge challenge, and then asks for real significant reforms from the nominee in exchange for his endorsement in the general. I think Sanders felt that assuring people that supporting him wouldn't increase any threat of a crazy Republican getting elected was the more important pursuit…