'Voters need to understand the stakes in the midterms. They will determine whether people with medical problems get the health care they need. It is clear that every Republican alternative to Obamacare would, hang Americans with pre-existing conditions out to dry. And the public backlash against that revelation is basically the reason the G.O.P.’s repeal effort failed. But it only failed narrowly. And if they still hold Congress next year, anyone who has a history of medical problems and doesn’t get health insurance from his or her employer will lose coverage. In fact, even getting a job with insurance coverage might not be enough: If the Trump-supported lawsuit succeeds, employers could refuse to cover new employees’ pre-existing conditions.