According to a CBS News public survey, 51 percent of Americans don't accept evolution. Note that the nationwide sample size was just 808 adults and that the error rate could be plus or minus four percentage points. But still... From the CBS News report:
Fifty-one percent of Americans say God created humans in their present form, and another three in 10 say that while humans evolved, God guided the process. Just 15 percent say humans evolved, and that God was not involved.Link (Thanks, Paul Saffo!)
These views are similar to what they were in November 2004 shortly after the presidential election...
Americans most likely to believe in only evolution are liberals (36 percent), those who rarely or never attend religious services (25 percent), and those with a college degree or higher (24 percent).
White evangelicals (77 percent), weekly churchgoers (74 percent) and conservatives (64 percent), are mostly likely to say God created humans in their present form.