Nearly 80,000 Maine residents have signed up for health care coverage through the HealthCare.gov platform since open enrollment began in November. Officials with the U.S. Department of Health & Human Services say 78,891 people from Maine have either signed up or had their coverage automatically renewed as of Jan. 9. That’s up substantially from last year, when 68,037 Mainers enrolled through HealthCare.gov for coverage in 2015. The deadline to enroll for 2016 coverage, starting Feb.