The fast rise of Sen. Elizabeth Warren within the Democratic Party has coincided with another phenomenon: the continual use by elite-media journalists of anonymous sources in articles that either criticize Warren directly or warn other politicians about the dangers of embracing ... the policies she advocates. That journalistic trend manifested itself most recently on Monday, in a piece by Ben White in Politico that quoted fully five anonymous sources - including "one top Democratic donor," "one moderate Washington Democrat" and "one prominent hedge fund manager" - to the effect that Hillary Clinton would be making a major misstep by selecting Warren as her running mate. Warren is an expert in bankruptcy and predatory lending and a leading critic of the financial industry. Is the "top Democratic donor" Politico quoted a self-interested executive at Citigroup or Goldman Sachs fearful that Warren would influence policy decisions? We'll never know. Journalists in this way let powerful individuals take potshots without any fear of accountability and without the reader being able to discern what conflicts of interest might be involved. And when it comes to Warren in particular, pretty much any "administration official" or "political strategist" interested in advancing a narrative gets the anonymous treatment. The Intercept in short order compiled a list of 15 other articles and political newsletters over the last few years of the anonymously sourced, anti-Warren genre.