Apparently the Compuserve forums have been open and are just being shut down.
The 2016 Democratic Party primary only looks rigged to those who either don't know or don't want to admit how party politics works. Vox has a good article summarizing how the party coalesced around Clinton and how her path to nomination was cleared, and there is nothing abnormal about it.
Vox concludes that there should have been more candidates in the Democratic primary, but I think that is convenient thinking that overlooks primary history. Jimmy Carter's re-election bid was thwarted part by a internal party struggle between he and Ted Kennedy. It is generally believed that a party should quickly fall in to line behind an incumbent president seeking re-election because that demonstrates unity and more importantly consolidates money.
Another important point that Bernie supporters refuse to accept is that he is not a Democrat. Two people attempted to hijack party nominations, one succeeded and became president while the other failed against a long-time Democrat. I just don't understand why anyone would think the Democrat elites, who really run the party, would ever blindly accept Bernie with open arms.
Those with a beef with the fact that Bernie didn't get a "fair shot" really have a beef with our overall political party process, and that is not really just a Democrat or Republican thing.