Will the 2 party duopoly ever end?

[kcguy]

In my opinion, third parties in the U.S. are only viable in two situations:

1.  The third party draws voters roughly equally from both major parties; or
2.  The third party limits itself to jurisdictions where one of the major parties routinely holds a 2-to-1 advantage.


In all other situations, it merely acts as a spoiler, helping the party it's most hostile to.