From the debate last night, as reproduced here:
Santorum said, “Just so I understand this, in Massachusetts, everybody is mandated as a condition of breathing in Massachusetts, to buy health insurance, and if you don’t, and if you don’t, you have to pay a fine.”
Moments later, as the discussion over Romneycare and Obamacare continued, Romney rebuked Santorum, saying, “First of all, it's not worth getting angry about.”