FOW- Why another lie 0bama?

What would this lie accomplish in a World broadcast debate??? Why did 0bama lie about their anniversary being yesterday and in front of 40 million people whan it is documented and has beend celebrated in the White House 3 other times on it's real date October 18th? Pity vote? An excuse for his inept ability to debate without teleprompters? Here it is from his actual site, verified authentic and dated by him himself.