It's not necessarily so. Some are apparently blind to common sense and led around by "pop culture". Surely an 8th grade history book does not deserve a chapter on either of the 2008 presidential candidates yet. ...And not after the election either, unless he really trys to alter American culture (which may transpire).
http://www.suntimes.com/news/metro/1225887,racine-obama-textbook101608.article