Commentators, almost always from the right, have documented liberal media bias for many years now. And the response by the perpetrators of this bias has been both constant and predictable: Circle the wagons and blame the accusers. Accuse us of bias for seeing their bias. The bias we've been talking and writing about is usually about partisan politics and hot social issues like abortion. But there's one kind of liberal media bias that hasn't gotten much attention. It's a bias that liberals both in and out of the media often attach to conservatives, but almost never to themselves. It's racial...