I haven’t yet read Hillary Clinton’s “What Happened,” but it seems pretty clear to me what did, in fact, happen in 2016.

These days, America starts from a baseline of extreme tribalism: 47 or 48 percent of the electorate will vote for any Republican, no matter how terrible, and against any Democrat, no matter how good. This means, in turn, that small things — journalists acting like mean kids in high school, ganging up on candidates they consider uncool, events that suggest fresh scandal even when there’s nothing there — can tip the balance in favor of even the worst candidate imaginable.

And, crucially, last year far too many people were complacent; they assumed that Trump couldn’t possibly become president, so they felt free to engage in trivial pursuits. Then they woke up to find that the inconceivable had happened.

Is something similar about to go down with health care?

Republican attempts to destroy Obamacare have repeatedly failed, and for very good reason. Their attacks on the Affordable Care Act were always based on lies, and they have never come up with a decent alternative.