From Jonathan Chait and The New Republic
Obama's plan closely mirrors three proposals that have attracted the support of Republicans who reside within their party's mainstream: The first is the 1993 Senate Republican health plan endorsed by former Republican Senator Dave Durenberger. The second is the Bipartisan Policy Center plan, endorsed by Bob Dole, Howard baker, George Mitchell and Tom Daschle. And the third, of course, is Mitt Romney's Massachusetts plan, which was crafted by the same economist who helped create Obama's plan, and which is rhetorically indistinguishable from Obama's.
Obamacare was, until recently, a moderate Republican health care plan by every substantive comparison or definition. The unanimity of Republican opposition says more about Republicans than it does about the plan itself.