Upton Sinclair? H. L. Mencken? William Jennings Bryan? C. E. M. Joad? Christopher Matthews? Paul Krugman? Anonymous? Question for Quote Investigator: Financial incentives can compromise the critical faculties of an individual. Here are four versions of this insight: I think either muckraker Upton Sinclair or curmudgeon H. L. Mencken employed this expression. Would you please …