Follow the Leader: Opinion Polls and the Modern Presidents
A book by Paul Brace and Barbara Hinckley. This was covered in a BookTV interview in 1992 (here).
They pointed to a late-in-the-race 1992 issue in polls. The pollsters moved from a Registered Voter to a Likely Voter model, and there was a bump for George Herbert Walker Bush, not because he was doing better, but because they changed the way they did the polls. But the fraudulent fact that he was "polling better" became headline news in many major papers.