Medicare, with it's 3-4% overhead, is one of best managed programs in the history of the United States and IT'S a SINGLE-PAYER SYSTEM.
Unfortunately Obamacare is NOT a healthcare system, but rather a program built on the premise that everyone, under the age of 65, will eventually be covered by PRIVATE health insurance PURCHASED from American corporations. No where in this program does any federal agency actually "take care" of anyone's health. That's still primarily the responsibility of private physicians and public hospitals, unless of course you're a veteran, but then that has always been the case.

OCU