FF, as they understand how left-wing goals are actually accomplished in this country.
By voting for a party whose mainstream has not been remotely leftist in 40 years?
The Democratic party has done a heck of a lot more for the causes of economic and social equality and justice in the past 40 years than Kshama Sawant and co. could ever hope to achieve.
Such as gutting welfare, removing the few restrictions on the parasitic financial industry, signing destructive trade agreements, killing both Americans and foreign civilians in imperialist interventions from Libya to Serbia to Iraq to Sudan, smashing union health care plans, fostering the growth of media conglomerates, forcing people into a parasitic private insurance system, and backing neoliberal education privatization schemes? Or is that all just a long con for the magical left-liberal utopia that Hillary will bring after the 2016 elections?