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When smear chain letters cite their approval in order to stop people from actually going to Snopes and finding out the truth.
It reminds me of the fake "Virus Warning" emails that went around a few years ago -- after a while they all started to include bogus references to McAfee or Microsoft or some other antivirus company.
Fortunately, on the Internet, Snopes is only a click away. Unfortunately, these emails seem to be circulating among people who are only slightly more skillful than John McCain with the Google.