There’s a lot of useful information in THIS PIECE by Jonathan Cohn, and here’s the upshot of it all:
Those are a lot of policy details, I know. But here’s a (relatively) simple way to think about it. Since modern health insurance first came to the United States in the 1930s, coverage has expanded, albeit fitfully, through a combination of private and public sector efforts. These efforts culminated in the Affordable Care Act, which, whatever it flaws, put in place a system that could eventually make affordable, decent coverage available to all Americans. Romney would run this process in reverse.
He and his supporters call that progress. Would you?