Health care was the drum that Democrats continually beat throughout the midterms, and health policy consultants and researchers agree it worked for them, but not as well as they might have hoped.

Now Democrats are going to have to refine that messaging for 2020 at the same time Republicans carve out their own health care message.

This election showed how much health care matters to people, Marie Fishpaw of the Heritage Foundation, former deputy assistant to Vice President Dick Cheney,...