Thats only when you don't get into the details of the implementation, and things like the need to pay for it with something like a European style VAT tax. When you dig in to the details in the polls, support plummets.
This isn't a critique of the idea, just noting the on the details almost no Americans actually support doing what it would take to implement.
> Look at death panels.
All healthcare systems have some kind of rationing, in America generally people who don't have employer provided healthcare and are neither especially poor or old get care rationed. This isn't ideal, I agree.