If you need people outside your party to vote for you, you don't restrict caucusing to just your party. Otherwise, you get the proverbial brick in the face. Must be a terrible legacy to lose to the person that makes up Trump in front of the entire world, that people said to themselves "Yes, he's a bigot, a xenophobe, a sexist; but he's not Clinton" as they voted.
@fatbird: I'm unsure why we're still arguing about this. Clinton lost because she did not have enough support, period.