Yes, the Republican party breaks the rules in picking their presidential candidates as well. That’s surely what happened in 2008 with the Ron Paul campaign, and I also believe that it happened in 1996 with the Pat Buchanan campaign. Delegates duly elected were simply ignored in the former case, in multiple states. Not saying that Paul or Buchanan would have received the nomination, but rules were broken. And some people here supported the cheating.
It didn’t stop me from voting for Ron Paul in Nov 2008! That act allows me to sleep well , without the stain of a McCain vote on my conscience