Let's pretend again that elections matter, how does it make any sense to vote blue to protest what team red is doing (or vice versa), when they all answer to the same donor class and banksters? Wouldn...
Third parties face a structural wall under first past the post: votes for smaller parties become wasted votes, and the spoiler effect lets a third party candidate dilute votes for the major parties, as with Nader in 2000. Duverger's Law formalizes why these mechanics keep producing a two party outcome.