Congressional Black Caucus opposes Sanders' requests

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The New Hampshire system would be a great compromise.  The larger problem is with states that require you to register months in advance (i.e. New York) in order to vote in the primary, although I'm not sure how many states use New York's absurd model.

But the number of unaffiliated voters is on the rise, especially with millennials, and it would behoove both parties to switch to an open or semi-open primary system if they want more to participate in them.  Of course, if it's something which boosts grassroots candidates and curbs establishment ones (which it does), don't expect anything to change this year, especially now that having a dissenting opinion on this issue makes you a racist.