Also, I wonder how can the Democratic party can still be credible in denouncing Republicans efforts to suppress voters the right to vote when employing the exact same tactics during the primaries.
I looked up one of the referenced incidents -- the botched poll in Arizona -- and based on other articles (see: https://www.washingtonpost.com/news/the-fix/wp/2016/03/31/ar...) it's hard to tell from a bird's eye perspective whether even that was "rigged".. or whether it was mere "incompetence".
I know FiveThirtyEight, referenced several times in the paper, (http://fivethirtyeight.com/features/the-system-isnt-rigged-a...) lean against the "rigged" argument, which is where I stand from a big picture perspective. Political shenanigans always happen, but regardless of this, demographics explain the result of the Democratic primary more than anything else. (That being said, in my opinion, the same demographics should frankly tell the Democratic Party to handle the Sanders supporters much better than they have been so far.)