For those who don't know, ProPublica (bold is mine) "is an independent, non-profit newsroom that produces investigative journalism in the public interest. Our work focuses exclusively on truly important stories, stories with 'moral force.' We do this by producing journalism that shines a light on exploitation of the weak by the strong and on the failures of those with power to vindicate the trust placed in them." It has received predominant funding from the Sandler Foundation (yeah, those Sandlers; Herbert Sandler is Chairman). Other contributors include George Soros's Open Society Foundations. Henry Louis Gates, Jr. (yeah, him) is also on ProPublica's board.
Translation: They lean left. Nevertheless, the organization's Stephen Engelberg (HT Instapundit) questions whether the Politico had enough information on sexual harassment allegations against Herman Cain to publish a story (bolds are mine):