Federalism is a good argument that has nothing to do with health care reform models, as Romney knows well. Here's what he should have said years ago:
"Everyone makes mistakes. Heck, I made a huge one. My plan, first hijacked by state liberals and now copied by Barack Obama, has created a fiscal nightmare in my state -- one that, according to the former Democratic treasurer, has forced us to cut back on other basic services.
"Though we promised an individual mandate would mean everyone would chip in, nearly 70 percent of the newly insured are subsidized by taxpayers -- with many paying nothing. Meanwhile, health care spending in our state is 27 percent higher than the national average, and we have a shortage of doctors, to boot. And that's just for starters.
"Let me be clear. I am not here to defend Romneycare. I am here to extract my name from that botched experiment by repealing its ugly stepson, Obamacare, so Americans work together to pass genuine, common-sense, market-based reform."
Then again, it is entirely possible Romney genuinely believes his health care model works.
If that's the case, his position just doesn't cut it.