The fact the Democratic platform adopted most of the populist left policies is a token truth juxtaposed to Hillary's
inaction on policy rhetoric. The post-Reagan Democrats have had a tendency to meet the Republicans halfway on economic policy as the latter kept shifting right, to the point where the ACA becomes an achievement for the previous administration despite originally being a right wing plan. Opposition is a necessary component of any democracy; the quandary is whether the policy one pushes starts distinct from contemporaries across the aisle or is already a diluted version of the opposition
The unique advantage of the populist left groups such as Justice Democrats and Brand New Congress is both the text on their platform and their speeches when given a platform. The absence of corporate money from special interests who are against certain policies psychologically frees candidates running on that platform to spearhead these provisos more liberally than a candidate who takes corporate donations. This is on top of policies that most Americans are in favor of