American right wing subversion of democracy

Anybody with a serious interest in protecting America's democratic institutions should pay heed to this article by a former Republican staffer who left his party in disgust. It paints a truly terrifying picture of where we are headed.

http://www.truth-out.org/goodbye-all-reflections-gop-operative-who-left-cult/1314907779

I see no reason why the US cannot have a multi-party system.
The biggest problem is that forming a third party would divide similar minded voters from their current party and weaken them. Tea Party would split the Republican Party, Green Party would split the Dems and so on. The party that doesn't split would usually have an easy victory.