The mainstream media treats Zogby and sometimes Zogby Interactive polls the same as regular polls, so I don't know if it really matters.
Just yesterday I saw Maddow stick in a Zogby poll with Barr getting 11% in New Hampshire along with other polls.
To be fair Maddow has very poor knowledge of polls and campaign tactics. She really relied on David Bender to talk about these issues on her radio show. She is much more knowledgeable about real issues though. Of course I would expect someone on her staff to trash the Zogby poll, but maybe they wanted to create a certain perception.
