Monday night’s spending agreement between the White House and Congress would repeal part of the Affordable Care Act. But the provision is a narrow one that few people knew existed and even fewer supported enthusiastically. The Obama administration had stalled writing the rules that would have put it into effect and, with no signs of imminent action, most Washington insiders figured it was only a matter of time before Congress took it off the books anyway. For better or worse, or maybe a bit of both, the provision was the regulatory equivalent of a dead man walking.