By: Mark Glennon*   Carol Marin and NBC5 evidently smell the backlash and danger to their reputations as the facts gradually come out about the now infamous article by Marin and Dave McKinney, also run in video by Marin on NBC5, alleging that Bruce Rauner threatened a former CEO of a company he invested in.   Both Marin and NBC5 have now issued pieces objecting to use of the original story by the Quinn campaign in its ads.   It’s a transparent stunt to try to restore a claim to integrity and balance. Quinn has every right to use exerpts