Because the US is shockingly sucktastic wrt health care for it's people. Most wealthy, developed nations provide good health care to its citizens via the government. The US provides health care as a benefit of full-time employee status. Contractor, part-time employees, unemployed people, homemakers and others often get screwed in this deal, which is likely part of why California is saying "You can't call these people contractors anymore."

National health care would resolve a lot of issues that get darkly joked about a la "The third world country of America."