Their goal, going back to Ted Kennedy (who has been sober for over 10 years now I think) is to make private health insurance and medical care expensive by government intrusion into the market, and government provided benefits easier and easier to qualify for, so that more and more people are forced out of the private sector and into the government system. This would eventually lead to citizens clamoring for a single payer system for all.
I pray that Trump’s initiatives can stem this tide.
You should read the horror stories about the NHS in the UK; it’ll be what would come here should the Dem’s get their way.