The most important political and intellectual reality in America today can be seen in a 2006 CBS News poll, which found that a large segment of Americans “do not believe that humans evolved.” This sentiment is usually discussed in religious terms. I suggest it should be seen as a political statement.
The Gallup Organization addressed the same issue, but also included the age of the Earth, and conducted a series of polls of American adults in 1982, 1991, 1993, 1997, 1999, 2001, and 2004. In each survey the wording of the questions was kept the same, so that the polls would be equivalents, and multi-year analyses could be carried out. Here is the data from the poll taken in November 1991. The only significant difference between this and the 2004 poll is that in 1982, 44 percent held the Creationist view and in 2004 this number was 45 per cent.