My idea for a progressive 3rd party

[Pat Mustard]

The problem with your positioning of the 3rd party Won2blv is that, institutionally, there's no left in US politics (even St. Bernie is Labour right in the Blair mode), you've just got the Tory right (protect traditional way of life), and Whig right (no government regulations). In economic terms both parties are Whig but in social terms (including maintenance of class divides) the Repubs swing hard Tory.

Introducing a third choice between the two is meaningless, as it'll quickly devolve into a clone of one or both. What is needed in US politics is a proper left leaning party.