Gary Wolf makes and interesting observation in Freud Meets Obama posted in AWOL Civilization:
It may very well turn out that the revelations concerning the Rev. Wright and other GDA [God Damn America] preachers are advantageous to Mr. Obama because it throws salt on the wounds of white guilt. Certainly, it may alienate many, but for the faithful it deepens the emotional bond between abuser and abused. This is critical for any such relationship: There must be no doubt as to the sincerity and perseverance of the abuser.