By McKinley Franklin Mary Walsh, a veteran CBS News producer of over four decades, is exiting the company, claiming in an exit memo to staffers that instructions to “aim our reporting at a particular part of the political spectrum” are partly why she’s departing. “We’ve been reading a lot of goodbyes lately and here I am headed out the door. It’s too soon, even after 46 years,” Mary Walsh wrote in a memo sent Friday, per The Guardian. “But maybe it’s for the best. We’ve been told to aim our reporting at a particular part of the political spectrum. Honestly, I don’t know how to do that.” The Guardian further reported that CBS Evening News executive editor Kim Harvey sent a separate message to staff in response to Walsh’s memo. “We wish Mary Walsh well and thank her for many years of service,” Harvey wrote, according to the outlet. “Mary wrote in her farewell note, ‘We’ve been told to aim our reporting at a particular part of the political spectrum.’ That is simply not true.…