Perhaps I'm naive but it would seem to me that decisions about one's health care should be made by the individual and their doctor - not a bureaucrat in Washington and certainly not a politician.
Lance also points to an excellent point made by Pundette on the issue of universal health care:
Every area of life can be made to fit under the umbrella of a government-controlled medical system. If it isn’t about our physical health, it’s about our environment, which impacts our health, or about preventive medicine. And nothing is more open-ended than the concept of “mental health.”
We've seen this in smoking bans, bans on trans fats, taxes that target certain behaviors, and a myriad of other issues. Anyone who thinks that government will be a benevolent actor in health care is kidding themselves. The marketplace may not be perfect, but with a few reforms it sure as heck beats the alternative.