If only to contextualize the Harris Poll I mention below, it is worth pointing out that science literacy in this country is fairly appaling. Witness the bi-annual NSF Science & Engineering Indicators (2004), which found that forty percent believe that astrology is either “very” or “sort of” scientific. This drops from 49% to 25% as education rises. It clearly should raise alarm bells if a quarter of college graduates feel that astrology can be even “sort of” scientific. Read the whole report … it should depress you even if you are an ID supporter.
The demographic for this survey was 7% with less than high school, 53% high school graduate, and 40% college graduate – thus 60% are high school or less – in the Harris Poll this was ~74%, thus perhaps indicating that the NSF survey may in fact be overestimating literacy.
Update: This report indicates a high school drop-out rate of ~30% nationwide. Thus it would appear that both the Harris and NSF data seriously under-represents that group and thus, I imagine, seriously under-represents the problem of scientific illiteracy.