Unfortunately, this Principles in Practice post doesn't link to it, but a recent study of cancer survival rates shows why socialized medicine (think "national healthcare" or whatever you want to call it) is deadly. The money quote:
The study finds that Britain (whose much-touted "universal health care" system is held up by the left as a model for America) has among the lowest cancer survival rates in the West—drastically lower than the United States, which has the world's highest survival rate.
It's simple, really:
Researchers attribute Britain's dismal numbers primarily to late diagnoses and lengthy waiting lists for treatment. But long lines and waiting lists are necessarily endemic under socialized medicine.
The solution is less government and more individual responsibility in healthcare. That is, unless we less of a chance to live.