This email, forwarded by a District Judge, tells you all you need to know:
"Normally I don't send or forward a lot of these, but even by my standards, it was a bit touching. I want all of my friends to feel what I felt when I read this. Hope it touches your heart like it did mine.
"A little boy said to his mother; 'Mommy, how come I'm black and you're white?'" the email joke reads. "His mother replied, 'Don't even go there Barack! From what I can remember about that party, you're lucky you don't bark!'"
What strikes me is not the hideous joke – but the sarcastic premise that it "touched his heart". Try to get your head around that for a minute. The suggestion that the president was conceived in a mass gang-bang of a white woman that included animals "touched his heart." He pretended to find it moving and poignant.