The "rigging" is all in the super-delegates. But, you know it's very easy to subtract them out when you look at the delegate counts. Other than their votes, all states have a set of rules that do not favor one candidate over another. Not the same set of rules, mind you, but still fair. The fact that one candidate in this race has more enthusiastic fans who are motivated to attend a caucus (as opposed to just a mail-in ballot like my area) is simply a matter of the rules for those states.
Are caucuses more democratic than primary elections? Got me!
