I just refuse to believe that 1/5 of Americans can't point out their own country on a world map. There's a lot of ways that any statistician can derive a result or a proportion using illegitimate methods. Basically, if you want to see a specific result from your experiment or study, you can get that result with enough effort and manipulation. I would really like to see their sampling method and the way they pose the question. The girl is just plain dumb, too.