IMO, the elites of America can't allow a Donald vs.Bernie contest as it would mean both sides [Dem/Rep] would be out if their control on free trade deals, citizen's untied and campaign finance reform, the war machine, Wall St bailouts, a potential deal with Russia, and the closure of Gitmo and other issues like 911 and torture. IMO, the elites, though well on their way, have not yet consolidated power completely and only a Clinton victory in November allows them to achieve that goal.
This unlikely situation results from the fact that the Democratic Party's voting process involving super delegates will guarantee a Clinton win and stop any chance of a Trump vs. Sanders contest, whereas the less controlled Republican process allowed Trump to win despite the Republican party's attempts to stop him. Consequently having Clinton in and Bernie, despite popular opinion, out now allows the elites to control the corporate owned and secretive electronic voting machines and guarantee that Clinton wins the election regardless.
Rigged voting machines is not a conspiracy theory as the corporate owned mainstream media will continue to trumpet endlessly. There many excellent, reliable sources whose work can be read and facts researched online. For instance, this excellent Democracy Now interview with author Harvey Wasserman who says in response to the question: Could the 2016 Election Be Stolen with Help from Electronic Voting Machines? that "that 80 percent of the 2016 votes will be cast on electronic voting machines, and we have no way of verifying their accuracy." Adding, "When you go to a bank, don’t you want the option to get a receipt of your transaction? Surely, this would be a simple and effective method for checking voting machines and confirming that your vote was registered for the correct selection. It is such a simple solution that you would think that anyone who opposes it is protecting the right to rig elections."
And here is the video of a computer programmer testifying that he was hired to rig the vote count in an election in Florida. As this man asserts, there are two ways to avoid this type of voter fraud: have a paper trail and access to the source code. Both are denied to the American public.
Finally, a Google Search of voting machines rigged returns many many more examples of how easy and widespread this problem is including: How Democracy is Hacked – Rigging Voting Machines
As Joe Stalin said, “Those who cast the votes decide nothing. Those who count the votes decide everything.”
The Democratic Party Machine is already saying they expect many crossovers from disenchanted traditional Republican supporters, And that may be true but in the opinion of many, including me, millions of Bernie's supporters will not back Hillary either. Some will stay home, but many who see the trade boondoggles, Wall St, and Big Oil's influence and the war machine as their top priority will be voting for Donald in November. This will be increasingly obvious to pollsters leading up to the election and in exit polls on election day.
If this scenario unfolds as i suspect, Donald, as he has shown he'll do [perhaps starting pre-election], will start hollering that the election is rigged to defeat him by the elites which could see millions of well armed Americans in the streets and the declaration martial law. These are dangerous times and on top of the global problems facing us all we face the fact that America's voting system is quite possibly rigged to guarantee the victory of the only corporate war machine candidate left standing - Hillary Clinton.