If the republicans are sincere about opposing government health care why aren't they running on repealing Medicare. For that matter those repubs over 65 should be voluntarily opting out of Medicare.
Some do want to privatize it and give vouchers to those who have paid into the system already. Nobody is fined for not enrolling in medicare.
My 87 yo dad has Medicare premiums taken out of his SS check. Guess everybody's gotta pay so pajama boy gets his for free.