It’s interesting that you mentioned marriage equality as a model you want to emulate. “Chapo Trap House,” a popular left-wing podcast, spent a lot of time criticizing your group. And they likened the push for ‘Medicare for all’ to the same-sex marriage fight ― that if you continue canvassing and building grassroots support, and educating people on the need to at least treat health care as a human right and, in their opinion, to make it free at the point of service, that, maybe not in two years or in four years but in 10 or 20 years, you’ll ultimately achieve your goal. And, in the meantime, you’ll move the Overton window, or range of politically acceptable views, to the left.
Source : https://www.huffingtonpost.com/entry/andy-slavitt-united-states-of-care-interview-congress-states_us_5a8744c3e4b00bc49f43edcd