A Healthy Blog notes that Massachusetts has reversed the national trend:
Since the enactment of Chapter 58, Massachusetts has increased the percentage of employers offering coverage to their employees. With the employer offer rate up 4% over two year, to 76%, we are climbing well above the national average of 60%. This increase occurred in spite of the recession. Most employees (80%) who are eligible for employer-sponsored insurance choose to enroll. There are large (and predictable) differences between small and large employers, with the small employers less likely to offer health insurance.
Full report here (PDF).