A good portion of the population in any event.
There's a certain segment of US citizens that don't have access to healthcare at all and can't afford it and that needs to change. This is about 16 million people. The government can literally go out and buy health insurance for these people for about 80 billion a year (I assumed a health insurance plan costing 5000 a year, more than what mine costs). Come up with a financial means to motivate these folks to find their own health insurance plan and I would be all for it.
To use Walmart again, they REALLY need to start providing their employees (yes all of them) insurance. All employers needs to at least give the their employees the option of healthcare. Sure, this will raise the price of goods, but it also keeps the government out of my damned healthcare (and also raising the price of goods).
But in any event, I just want the government to stop trying to fix a system that isn't broken. 88% of people are happy with their current healthcare. I'm happy with my healthcare, don't screw with it just because 12% of the population is unhappy with theirs.
Why do other countries spend less on healthcare and have healthier populations if government in the health care is such a bad thing? Is it possible that you've been sold a lie?