ITT: a bunch of non-native English speakers lecturing native English speakers on the meaning and usage of English words in colloquial English :-/

Ok, not a downvoter, but I’ll bite. A system with more than one party is more democratic than a system with a single party. Are you asking which of the two major parties in the US is the “second” party, making the US more democratic than if there were a single party? If so, I see why no one is answering. If not, perhaps you could clarify your question?