Main Street may be about to get its own gigantic bailout. Rumors are running wild from Washington to Wall Street that the Obama administration is about to order government-controlled lenders Fannie Mae and Freddie Mac to forgive a portion of the mortgage debt of millions of Americans who owe more than what their homes are worth. An estimated 15 million U.S. mortgages – one in five – are underwater with negative equity of some $800 billion. Recall that on Christmas Eve 2009, the Treasury Department waived a $400 billion limit on financial assistance to Fannie and Freddie, pledging unlimited help....