She needs to attack Bernie's specific plan, not single payer in general. The UK, for example, has a far better system than the USA, even though it's beyond unfeasible to ever establish a system like that here.
She needs to emphasize that Bernie's plan is a takeoff on Canada's system, which is inferior to the system we already have (Obamacare, but that should always be framed as the "American" health care system because that's what it is).
What makes you think that, or is just because of the politics of Congress that you think that?
A government takeover of every hospital in the country would be a tall order if there were 535 Sandernistas in Congress.
Even though it would theoretically be more efficient and cost-effective in the medium- and long-term, think about how many people who regularly see their doctors who would have some kind of disruption. And think about all of the people who work in the health care industry that would potentially be put out of a job.
