Pay attention lefty idiots! online.barrons.com OBAMA THE ORACLE? “The president last week took a break from the arduous task of carrying the world on his slender shoulders to offer a prophecy that could only warm the cockles of Wall Street’s heart (and we’re taking it strictly on faith that it has one). He ventured that this was a good time to buy stocks. Some old Street hand obviously tutored him on the art of stock-market forecasting because he immediately qualified the recommendation by …