Ph, you are just as guilty as the M&Ms in terms of stifling dialogue on here...
I would say that the candidates in this race who are running as progressives are Warren, Sanders, Gillibrand, and Harris. I can imagine that there will be some disagreement over the last two.
Booker, Buttigieg, and O'Rourke are rhetoric progressives, but don't have anything in their records at this point to suggest that their platforms will ultimately be progressive. Booker is a weird one. He supports reparations, but has already walked back his position on health care. He also has weird politics regarding corporate regulation, financial policy, and education.
Feel free to agree or disagree.
See, it's not hard, y'all! Just say what you believe.