Yes, it's rigged by the same people who rigged it in 2016 - lazy millennials/X/Y/Z/whatever-the-fuck-comes-after-Z who support Bernie when polled but can't get off their asses to actually vote. There is lots of evidence of that (exit polls, turnout numbers) and zero evidence of actual voting fraud/manipulation. Voter suppression is a meaningless argument in a primary, particularly when the winning candidate has a significant minority support. Also there's absentee/mail-in voting.
The worst thing you can do now is to come up with conspiracy theories to justify it. Then don't show up in November and complain about Trump for the next 4 years.
There is more than zero evidence as a matter of fact.
Popular Mechanics had an article looking over a small fraction of the numbers in Iowa: (
https://www.popularmechanics.com/science/math/a30810883/iowa-caucuses-math-errors/)
The full picture painted by the data is 101 votes for Sanders, 66 for Buttigieg, and 48 for Biden, plus 25 uncommitted voters, for a total of 240. Delegates were officially distributed 4-4-2 for Sanders-Buttigieg-Biden. But that should have been 5-3-2.
Why? Because after the first calculation step, Sanders had 4.21, Buttigieg had 2.75, and Biden had 2.0. These round to 4, 3, and 2, respectively, which add up to 9. The precinct had 10 delegates to give out, so it needed to give the final delegate to the candidate closest to their next delegate.
That's only a small part of the picture, but "mistake" after "mistake" it always went against Bernie.
Here's an excerpt from an article from the Guardian Titled: California's rules for independent party voters could suppress the Bernie vote
These 5 million independents legally have the right to vote in the Democratic primary, but the Democratic party has created an inscrutable obstacle course for them to do so, one that amounts to another type of voter suppression.
The problem begins with a postcard.
Last autumn, all 5 million NPP voters were mailed a postcard allowing them to request a ballot with the Democratic party presidential choices. However, as many states have learned, postcards with voter information largely look like junk mail and get thrown out.
If the independents don’t respond to the postcards, they get a ballot without presidential choices. But they have one more chance to vote for a candidate in the primaries: at the ballot box.
So, if a young person in California ends up having the choice to either wait 5 hours in line and vote, or piss off their boss and get their hours cut, I wouldn't blame them for not voting.
About the exit polls I'm going to use some numbers from TDMS research, who cite their numbers.
Texas primary:
In this election candidate Sanders saw the largest discrepancy between the exit poll and computer vote counts. His projected vote proportion fell 4% in the vote counts—an 12% reduction of his exit poll share. The combined discrepancies between the exit poll and the vote count for candidates Sanders and Biden at 4.4% significantly exceeded the 2.9% margin of error for the exit poll difference between the two.
Michigan
The large discrepancies greatly exceeded the margin of error for the exit poll projected differences between candidates. In this election candidate Sanders underperformed his exit poll projected proportions by 15.4%. Sanders consequently received 105,000 less votes than projected while others (mainly Biden and Bloomberg) received 111,000 more than projected by the exit poll. Of concern is Michigan’s destruction of the ballot images, that could have been used to greatly facilitate a recount, that were created by their scanners for their counts. This destruction appears to violate both federal and state laws.
California
The combined discrepancies between the exit poll and the vote count for candidates Sanders and Biden currently totals 7.7%; more than double the 3.1% margin of error for the exit poll difference between the two.
Vermont
In this Vermont election candidate Sanders saw the largest discrepancy between the exit poll and computer vote counts. His projected vote proportion fell 6.3% in the vote counts—an 11% reduction of his exit poll share. Biden with an exit poll share of 17% and in danger of receiving 0 delegates (if his vote count fell below 15%) outperformed his exit poll share by 4.5% in the vote counts—a 26.1% increase of his exit poll share. The combined discrepancies between the exit poll and the vote count for candidates Sanders and Biden at 10.8% was double the 5.4% margin of error (95% CI) for the exit poll difference between the two. See table below.
Massachusetts
The discrepancies between the exit poll and the vote count for Sanders and Biden totaled 8.4%— double the 4.0% margin of error (95% CI) for their exit poll differences. Warren’s and Biden’s discrepancies also totaled 8.4%, again double the margin of error (95% CI) for their exit poll differences. . These discrepancies replicate the total discrepancy of 8.0% favoring Clinton in the 2016 Massachusetts Democratic Party primary between her and Sanders. This time two progressive candidates exhibit the same discrepancies now favoring Biden representing the establishment’s choice.
South Carolina
Of all presidential candidates, Biden’s vote count exhibited the largest disparity from his exit poll projection. His unverified computer-generated vote totals represented a 8.3% increase of his projected exit poll share. Given the 528,776 voters in this election, he gained approximately 19,700 more votes than projected by the exit poll. This gain came at the expense of other candidates—mainly candidates Sanders, Warren, and Steyer. Exit polls are widely recognized—such as by, for example, the United States Agency for International Development (USAID)—as a means for checking the validity of unobservable computerized vote counts.
New Hampshire
The recent New Hampshire Democratic Party Primary computerized vote count results differ significantly from the results projected by the exit poll conducted by Edison Research and published by CNN at poll’s closing. The disparities exceed the exit poll’s margin of error. Of all presidential candidates Buttigieg’s vote count exhibited the largest disparity from his exit poll projection. His unverified computer-generated vote totals represented a 12% increase of his projected exit poll share.
Fittingly, according to a recent Gallup World Poll, only 40% of Americans say they are confident in the honesty of U.S. elections. Finland and Norway with 89% of their citizens expressing confidence in the honesty of their elections along with the citizens of 25 other countries have greater confidence in their elections than do Americans.