President Barack Obama will have to deliver one of the finest speeches of his presidency next Tuesday if he hopes to win Congressional support for a strike against Syria. Out of nowhere, the Syria vote has emerged as one of the defining moments of Obama’s second term.

With three years remaining in office, the vote will either revive his presidency or leave Obama severely weakened at home and abroad.

There are legitimate criticisms of Obama's initial response to the Syrian government’s barbaric August 21st gas attack outside Damascus. The president should have demanded that Congress be called back from recess immediately. He should also have immediately made a far more personal and passionate case for strikes.

But what may doom the president’s effort, in the end, is not his short-term tactics. It is years of contradictory policies and unfulfilled promises by Obama himself.

As Charles Blow noted in the New York Times this week, this is the “Era of Disbelief,” where Americans don’t trust their president or Congress. Blow rightly cited Iraq as the primary cause. But a litany of other government half-truths have pushed the public’s trust in its government to record lows.