Well, Bill Weld was/is a rare specie known as a Moderate Republican.
They are indistinguishable from today's Democrats.
The Green Party doesn't have the funds to be that noticeable. But, I's sure they'll snag some of Bernie's crowd.
Alex
"There is a cult of ignorance in the United States, and there has always been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that "my ignorance is just as good as your knowledge."
-- Isaac Asimov