That the mainstream media have a liberal bias is hardly a belief limited to those on the right. Indeed, many liberals and even media personalities themselves will readily agree. But is it possible to scientifically measure media bias? Can one statistically prove its existence and determine precisely how strong it is? In his new book, Left Turn: How Liberal Media Bias Distorts the American Mind, UCLA political-science professor Tim Groseclose attempts to do precisely that. - - - - - - - - - - ...