Picture if, say, the Socialist Party USA instead of the Green Party, were America's leading left-liberl party.
Instead of attacks claiming the Greens are anti-science, we'd have attacks claiming the Socialists are anti-economics.
We know this from the attacks Hillary Clinton and her allies and surrogates launched against non-socialist social democrat lite Bernie Sanders.
See, national Dems are like Goldilocks, always wanting the bed that's "just right." Hillary just practices a more incremental version of this.
Well, first, the GOP, to turn the old Overton Window into a new parable, keep resizing, or to riff on an employment word, downsizing "just right," and national Dems then keep contorting themselves into tighter quarters.
Eventually, to riff on John Nance Garner, that "just right" isn't worth a warm bucket of piss.