Last week, Rupert Murdoch was at the center of a media-on-media spat with Google. This week, it's his flagship newspaper, The Wall Street Journal, trading blows with arch-rival The New York Times. The bout began when the Times' David Carr penned a column tweaking the Journal for moving further right since Murdoch's takeover two years ago. Firing back, the Journal's editor-in-chief Robert Thomson responded:

The news column by a Mr David Carr today is yet more evidence that The New York Times is uncomfortable about the rise of an increasingly successful rival while its own circulation and credibility are in retreat. The usual practice of quoting ex-employees was supplemented by a succession of anonymous quotes and unsubstantiated assertions. The attack follows the extraordinary actions of Mr Bill Keller, the Executive Editor, who, among other things, last year wrote personally and at length to a prize committee casting aspersions on Journal journalists and journalism. Whether it be in the quest for prizes or in the disparagement of competitors, principle is but a bystander at The New York Times.
Not to be outdone, the Times' executive editor Bill Keller swiped back in a statement to Politico:
While David's column clearly got under Mr. Thomson's skin, I don't see anything in his response that casts doubt upon it. The column was scrupulously fair and, if anything, understated, and I have no inclination to help Mr. Thomson change the subject.