During the Republican National Convention, Clint Eastwood had a conversation with an imaginary Barack Obama in an empty chair. During the exchange the real President Obama Tweeted that "This chair is occupied."
Actually, it isn't. Obama gave up trying over a year ago when he announced that he would release a new jobs program as soon as he got back from his August vacation. What he eventually released was totally unacceptable to the Republicans as he knew it would be. He started leading chants of "Pass the bill" even before any bill had been introduced to Congress. The whole exercise was nothing but a cheap attempt to score political points against the Republicans.
That has been the President's mode of operation ever since. He stopped trying to perform his duties as President. He spends all of his time and effort trying to win reelection. The chair of President of the United States and leader of the Free World has sat empty.