The funniest thing about your lazy "rig" attack is that the national parties DO NOT RUN THESE PROCESSES!
It's literally entirely state-run.
So, according to Donald Trump and Bernie supporters, the Iowa state Democratic Party is rigging their own caucus by feigning incompetence purely of their own accord to help Washington insiders. The minority party of a tiny conservative state is self-rigging to help DC oligarchs, apparently.
Ridiculous.
EDIT: For the record, you are amplifying dangerous political disinformation that is being intentionally used to sow discord and division by the GOP https://twitter.com/jimsciutto/status/1224672579023261707
EDIT2: If you truly want to see a "rigged" process, look at the GOP, who have CANCELLED dozens of primaries and declared Trump the nominee by act from on high. Literally just cancelled democracy. But sure, caucuses suck.