As we enter 2015, the politics of the president’s health care law are little changed from last year or the year before, or any year since it was passed. The details change with the calendar, but year after year, the law remains a major drag on President Obama’s popularity and legacy. Defenders of the law commonly known as Obamacare continue to believe the law will eventually become popular and point to a growing number of people with insurance as proof the law is working.