The issue of how to stabilize the Affordable Care Act's individual market, until recently a prime focus of health policy debates, has receded from center stage in midterm campaigning as candidates turned to politically salient topics such as protections for people with preexisting conditions and the debate over single-payer. Experts suggest candidates are avoiding market stabilization policies, such as reinsurance, since they aren’t as politically galvanizing as other health care issues, and also because the relatively stable 2019 premiums make...