A Huffington Post article slamming U.S. Attorney Carmen M. Ortiz for prosecuting “the good guys” has raised questions over whether Mayor Martin J. Walsh is waging a PR counteroffensive against the feds after they indicted two top City Hall aides on extortion charges. Walsh’s chief of staff, Daniel A. Koh, formerly served as chief of staff to Huffington Post Editor Arianna Huffington and as general manager of Huffington Post Live before joining the mayor’s inner circle. Walsh told the Herald last night that he and his staff had no involvement in yesterday’s Huffington Post story titled, “This Federal Prosecutor Is...