That a left-of-center bias grips the old media is undeniable. Too many years of content analyses and newsroom surveys close the case. So how do journalists in denial press on? They accuse their colleagues of being "lap dogs." It doesn't get more serious than the recent dispute over The New York Times's spilling of a classified counterterrorist program. But that spat with the administration, indeed over a serious breach of the national security, climaxed decades of the media's steady drift to the left. Some prominent figures in the establishment media, lapsing into momentary honesty, do admit the diagnosis. The late...