@janbb
The following part of this article agrees with you:
“Someone is challenging Hilary Clinton for the Democratic nomination. And that someone is Bernie Sanders, the Senator from Vermont.
Or is he? There is talk all over that, even though he has thrown his hat into the ring, Bernie is not focused so much on winning as on dragging Hilary (or whoever is nominated) to the the progressive left. In other words, he is in the race to do what Elizabeth Warren says she is trying to do outside the race: force the Democrats towards a progressive position on many topics.”