What ever happened to the Roper Poll?

[Oldiesfreak1854]

I think it might have had to do with their Holocaust poll: "Does it seem possible, or does it seem impossible to you that the Nazi extermination of the Jews never happened?"  One of my PoliSci instructors at my college mentioned this Roper poll, which was taken in the early 90s.  You might be familiar with it.  It showed about a third of Americans expressing doubts as to whether the Holocaust was real, which shocked many because it was only about 50 years since it had occurred and most of the WWII veterans who had liberated the concentration camps were still alive.  The question was confusing (double negative: "impossible that it never happened"), and Gallup took the poll with a differently-worded question, and the results showed a significantly smaller percentage of people doubting the reality of the Holocaust.

And of course, Dukakis lost, so I don't see how they were one of the most reliable pollsters if they had him leading, after he began to drop.