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CNN Senior White House Correspondent
President Obama apparently buys into that old slogan about never letting 'em see you sweat.
Despite the pressure of his first speech to a joint session of Congress at a time of national crisis, two senior aides tell me the President quietly had only one full dress rehearsal with a teleprompter at about 6pm ET in the White House's historic map room.
The significance is that predecessors like Bill Clinton and George W. Bush used to go through at least a few - maybe even several depending on the situation - dress rehearsals for a speech like this to get it just right. Just one session suggests a man feeling pretty confident despite the intensity of the crisis.
As one senior aide told me, "This moment in time needs clarity and a sense of purpose."
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