We're paying the salaries of tens of thousands of bureaucrats to administer Medicare/Medicaid; much of the money we spend isn't going to the hospital or the doctor; it's going to bureaucrats who don't provide any health care. Furthermore, with any bureaucracy, there is very little accountability when there is waste, fraud and abuse. Because tax payer dollars isn't the bureaucrats' money, they have little incentive to pay attention to waste, fraud, and abuse. This is why Medicare fraud and waste costs taxpayers around $100 billion/year.
If the government stayed out of healthcare, costs would plummet like they have with LASIK eye surgery and other procedures where the government isn't involved. Medicare doesn't pay for LASIK, so the consumer has to spend money out of pocket and that consumer will do a much better job looking out for waste and abuse than a bureaucrat sitting in some office building hundreds of miles away.
The problem with the Dems running is that few of them understand economics; they do not understand how taxes and regulations affect the economy. Bernie and Warren have no idea why a $15 minimum wage is a bad idea. It's all based on emotion. This is why Reaganomics and Trumponomics have both been spectacular successes. They relied on economists who relied on empirical evidence, not emotion. If you recall, NYT economist Krugman actually predicted a global recession when Trump got elected; this was purely an emotional reaction. Krugman should probably return the Nobel Prize because he doesn't deserve it.