Before a single town hall, debate, primary or caucus, Mitt Romney’s blown his chances for the presidency in 2012. What the 2008 also-ran had to say today on Fox News Sunday was the same thing I and others have witnessed him say a half dozen times over the past few months behind closed doors — a stubborn refusal to admit any similarity between President Obama’s national health care plan and his own disastrous solution in Massachusetts. Here’s one quote: There’s a big difference between what we did and what President Obama is doing. What we did, I think, is the...