ADVANCE FOR MONDAY, SEPT. 5 AND THEREAFTER - FILE - In this Oct. 9, 1973 file photo, President Richard M. Nixon meets Secretary of State Henry Kissinger in the Oval Office of the White House in Washington. Nine weeks out from Election Day, the electoral math favors Democrat Hillary Clinton. But both Clinton and GOP rival Donald Trump know there are countless ways the trajectory of this uncommonly volatile presidential campaign still could shift in unexpected ways. (AP Photo/Harvey George, File)