GOP struggles to avoid ObamaCare boomerang amid shutdown 

The shutdown debate over expiring enhanced ObamaCare subsidies has put Republicans on the defensive over health care, reopening old wounds over the 2017 attempt to repeal and replace the law.    Fifteen years since the Affordable Care Act was passed, the scars from the repeal effort and the GOP’s lingering disgust for the law are influencing the party’s scattered response. [...]