The Barack Obama campaign is desperately hoping that most Americans are dumb hicks with the memory retention of soap dishes; because if they start to compare what he said in that Philadelphia “race” speech last March with what he said last Tuesday, he’s sunk: The ‘Race’ Speech Revisited.

“I can no more disown him [Jeremiah Wright] than I can disown my white grandmother.”

— Barack Obama, Philadelphia, March 18

Guess it’s time to disown Granny, if Obama’s famous Philadelphia “race” speech is to be believed. Of course, the speech was not just believed. It was hailed, celebrated, canonized as the greatest pronouncement on race in America since Lincoln at Cooper Union. A New York Times columnist said it “should be required reading in classrooms across the country.” College seniors and first-graders, suggested the excitable Chris Matthews.

Apparently there’s been a curriculum change. On Tuesday, the good senator begged to extend and revise his previous remarks on race. Moral equivalence between Grandma and Wright is now, as the Nixon administration used to say, inoperative. Poor Geraldine Ferraro, thrice lashed by Obama in Philadelphia as the white equivalent of Wright’s raving racism, is off the hook.

These equivalences having been revealed as the cheap rhetorical tricks they always were, Obama has now decided that the man he simply could not banish because he had become part of Obama himself is, mirabile dictu, surgically excised.

At a news conference in North Carolina, Obama explained why he finally decided to do the deed. Apparently, Wright’s latest comments — Obama cited three in particular — were so shockingly “divisive and destructive” that he had to renounce the man, not just the words.

What were Obama’s three citations? Wright’s claim that AIDS was invented by the U.S. government to commit genocide. His praise of Louis Farrakhan as a great man. And his blaming Sept. 11 on American “terrorism.”

But these comments are not new. These were precisely the outrages that prompted the initial furor when the Wright tapes emerged seven weeks ago. Obama decided to cut off Wright not because Wright’s words or character or views had suddenly changed. The only thing that changed was the venue in which Wright chose to display them — live on national TV at the National Press Club. That unfortunate choice destroyed Obama’s Philadelphia pretense that this “endless loop” of sermon excerpts being shown on “television sets and YouTube” had been taken out of context.