Why is Romney not taking heat from his Republican rivals for mandating health care in Mass.?

Romney has been ridiculing all the rivals that threaten him for the nomination. Since he thinks political attacks are fair game, why aren't they calling him out for his anti-freedom, anti-individual-rights stance of forcing people in his state to buy health insurance? Isn't that anti-American and anti-capitalism? In this county isn't our freedom to make choices about out own well-being the most important principle of our founders? Why has he escaped from this criticism?

Giuliani already called him up on that. Romney is truly a hypocrite for pretending to be a fiscal conservative.