I live in a caucus state. It's an invitation for the cause-driven fanatics to stuff the room and game the system. The Washington caucuses were rife with young Obamaniacs who shouted down and shut out the long-time Democrats in the room. Couple that with the fact that they purport to be "popular" but (by imposing a two-hour participation window) make it impossible for many working people to be involved in the process, and there's no way they should be considered part of the popular vote. If states want to use it as a nominating method, fine (bad idea, I think, but their right) -- but you can't call it "popular vote."