Given that no one has ever asked any other president to produce his birth certificate, is it really possible to explain the birther phenomenon apart from a conscious or subconscious element of racism and/or xenophobia? I pose it as an honest question, but I sincerely have not been able to come up with any likely answer other than yes.
I am long convinced that most of us do not believe what we believe because of evidence or a real interest in the objective truth. We believe what we believe overwhelmingly because we want to believe certain things. Only someone who is willing to change his or her opinion given reasonable evidence is really interested in the truth. This more than anything else is what education is supposed to teach you.