

Statistically speaking, that would split the American “left” vote while not affecting the number of republican voters at all. At best it would give the republicans at least a minority government in every election for a long time and nothing will change. As impossible as it seems, the best course of action would be to try to effect change in the democratic party instead of trying to run against them. It really a shitty scenario with no real winning solution at present.
If the current trade agreements with Canada, Mexico and Japan are so terrible then whoever it was that signed them is probably unfit to try negotiating new ones. Oh wait, that was also Donald Trump.