Ultimately, trying to measure NPR’s ideological tilt by the volumes of critical mail received from each side is a rotten methodology to measure of the fairness or balance of the actual on-air product, and Dvorkin ought to know that. It would be the same as measuring the number of critiques an AIM or MRC does on NPR, versus FAIR or MMFA. Liberal critics think of public broadcasting as their sandbox, so they’re often fiercer in defending it from an alien invasion from Fred Barnes or Rich Lowry.