>>16
Those two parties have changed radically
How? On the surface with silly issues like abortion? Bahfah! The GOP has been conservative even prior to Southern Strategy.
Dixie Democrats
The States' Rights Democratic Party was an entirely separate third-party that wanted to revive the reconstruction era policy of the Democratic Party's southern members. Not an example at all.
And remember that Richard Nixon signed the EPA into existence.
And George W. Bush signed NCLB into existence. What's your point?
It's not like more parties is some magical fix for everything
No, however multiple parties at the Federal level would help get ideas like abolishing shitty free trade agreements into action, rather than just from a few fringe congressmembers as is the case today. Libertarians don't really have a say in congress beyond the aging Ron Paul, and the Libertarian Party remains on the fringes, instead of its members being elected to congress as would be the case if the US had a multi-party system in place. Same thing goes for Green Party members, etc.
Some countries have too many parties and can't get anything done because of it.
I wouldn't use Belgium as an example. It doesn't refute the advantages of having a multi-party system, though.