David Hogberg counts the reasons:
In 1986, a Republican-controlled Senate approved and a Republican President signed into law COBRA and EMTALA, two major expansions of government regulation of the health care industry. In the mid-1990s, a Republican-controlled Congress approved another big expansion of government regulation called HIPAA and a new government health insurance program, the State Children's Health Insurance Program (SCHIP). In 2003, the GOP Congress and Republican President Bush created a huge new entitlement with the Medicare Prescription Drug Program. Now some Republicans in the Senate, specifically Orrin Hatch and Chuck Grassley, are leading the charge for a big expansion of SCHIP.