http://atheism.about.com/od/atheistbigotryprejudice/a/AtheistSurveys.htm
Not sure if this is the same one I read, but it shows the same trend.
It sounds to me like that poll really found out more about how Americans define the word “moral” than it found out about atheists.
Ask them: “Would you feel safer spending the night with an American atheist or spending the night with a radical, fundamentalist Muslim?” and I’ll bet they choose the American atheist hands down. :>)