The president, meeting with U.S. mayors at the White House, vows to use his full power to expose any misuse of the $787 billion in economic stimulus dollars. Even as President Obama told the nation's mayors today that they now have a friend in the White House, he warned that he would use the "full power" of the presidency to expose and crack down on them if they misuse the stimulus dollars meant to boost the economy out of its doldrums.