From The Anti-Empire Report #145:
On more than one occasion during the recent US primary campaign, Senator Bernie Sanders was asked if he would run on a third-party ticket if he failed to win the Democratic nomination. His reply was a form of the following: “If it happens that I do not win that process, would I run outside of the system? No, I made the promise that I would not, and I’ll keep that promise. And let me add to that: And the reason for that is I do not want to be responsible for electing some right-wing Republican to be president of the United States of America.”
So instead he’s going to be responsible for electing some right-wing Democrat to be president of the United States of America. It’s certainly debatable who’s more right wing, Clinton or Trump. Clinton surely earns that honor on foreign policy. Think of Syria, Iraq, Honduras, Yugoslavia, Libya … et al.
The revelation that the Democratic Party was secretly favoring Clinton over Sanders is reason enough for Sanders to have broken his promise and accepted the offer of the Green Party to be their candidate.