Thank you Lon for actually taking Election Fraud seriously. I just wanted to say that. It gives me hope we may yet rescue our democracy whenever I notice someone actually thinking about this. There’s generally a taboo about even considering it in the corporate media, and this is the first thing we must challenge.

I don’t have time to write a response to everything you’ve said, but several essential points to consider:

1. The primary wasn’t about votes or states but about earned delegates. Please run your numbers to see the number of delegates Bernie would have won had the machine results matched the exit polls. Bernie Sanders wins the primary. This doesn’t even take into consideration the massive voter suppression in Arizona, New York, California, Puerto Rico, Iowa, Illinois, and others.
2. Caucuses are imperfect but they are far better than primaries at this point. So long as we use blackbox voting machines with secret, private code, we have no idea (other than exit polls) whether the votes are being counted fairly. Caucuses can show a slight bias towards more enthusiastic and informed voters, but that bias is ridiculously less important than the fact that caucuses are nearly impossible to rig (Wyoming a lone counter-example) and are impossible to hack with computer vote-counting software. Actual human people must be counted for each vote. Personally, the small bias mentioned aside, any rational observer of our flawed American elections has to trust the caucus results far more than the primary results at this point. (That 538 article — and many of their articles this primary year — is tendentious and incorrect.)
3. It’s absolutely not true that California has a paper trail for all votes! I vote here in California and pay attention to the voting systems. I wrote an entire article just on the ways the California election was rigged and stolen:

Is Democracy Dead in California?

One thing that’s interesting about California is that there is actually one county in the state that uses open-source vote-counting software. This is a rare thing in the country these days. Humboldt County counts its votes using software the public can review. Guess how Bernie Sanders did in Humboldt County? He took 71% of the vote, his biggest win in the state. Doesn’t prove anything, of course, on its own. Just one more data point.