Earlier quoted context omitted.
Be aware that Medicare is a long way from free. At least if you've had a well-paying job in the past few years, Medicare premiums are pretty similar to exchange costs (or COBRA).
Everyone knows Medicare isn't "free". Medicare and COBRA are not similar costs. My parents pay half what I would pay if I took COBRA and they have a better plan. Neither of them were struggling before they retired and I'll put it this way, they bought a second home in retirement.
No they don't. A lot of the "Medicare for All" crowd assumes that "medicare for all"/universal healthcare is free or at least very low cost rather than something that's in the ballpark of unsubsidized individual/family healthcare plans which is the reality at least within a few years of leaving the professional workforce.