President Obama and his chief of staff have said that the only non-negotiable principle in the health care debate is success, by which they seem to mean passage by Congress of something. From their perspective, that’s a smart place to be. With such large Democratic majorities in both the House and the Senate, just about anything that passes will tilt heavily toward Democratic priorities, which is to say toward heavy governmental control.

The problem of course is that most Democrats don’t want a “down payment” or “progress” toward their goals. They want the whole thing: a full government takeover, and so-called universal coverage. They see this year as perhaps a once in a generation moment to get what they want, and they aren’t about to settle for something less until its clear they can’t get it.

Which is why Democrats have dug in for a fight even as it has become increasingly apparent that passing a government takeover of American health care on a partisan basis will be exceedingly difficult. Senate Majority Leader Harry Reid has been downplaying the importance of “bipartisanship” in health care, and suggesting that perhaps he only needs, or wants, a handful of Republicans to support the bill Democrats are trying to write in the Senate. Meanwhile, Senator Chuck Schumer has let it be known that he is not willing to abandon the concept of a muscular, government-run insurance plan just to get Republicans on board.

But it is hard to overstate the difficulties Democrats will face if they try to pass the kind of bill they are talking about on an entirely, or even mainly, partisan basis. It is chock full of controversy. The price tag (at least $1 trillion in new spending). The largest tax increase in decades, which would hit the middle-class too. The movement of tens of millions of people out of job-based coverage and into government-run insurance. Deep, arbitrary, and cost-shifting cuts in Medicare’s reimbursement rates. Job-killing mandates on employers. And, most especially, the prospect of government intrusion into medical practice and the rationing of care. These are all highly unpopular steps with most voters, and the Democratic strategy is predicated on somehow getting all of them passed in one bill.

So what’s the Democratic game plan to overcome all the obvious political obstacles? Hard to know for sure, but it looks mainly like a “make it up as you go” approach. Cut a deal with Pharma today. Extract some Medicare savings from hospitals tomorrow. Float a “co-op” as a fig leaf for government-run insurance to entice some Republicans. Keep working the deals and hope it adds up at some point to a bill. Above all, of course, “keep moving forward” to hold everyone at the so-called table.

It might work. But it might not too. The primary problem for Democrats is not stakeholders. It’s the general public. They were told “reform” would leave them alone if they liked their coverage — and their premiums would go down too by $2500 per year. But the bills the Democrats in Congress are now writing will increase costs for people with insurance and shift tens of millions of them out of the employer plans they generally like. That’s not the deal they are expecting to be offered, and they aren’t likely to agree to it anytime soon.