Can’t liberals be just as stiff-necked as Lieberman? Sure, they could. But liberals members do have an incentive to compromise—the tens of thousands of people who die every year for lack of health insurance. The leverage that Lieberman and other “centrists” have obtained on this issue (and on climate change) stems from a demonstrated willingness to embrace sociopathic indifference to the human cost of their actions.

Matthew Yglesias on Joe Lieberman’s obstructionism.