That's no video, that's audio. Easily faked. There are news stories about audio faking capabilities being demonstrated on Colin Powell, and...

You wouldn't believe me, so here it is:

When Seeing and Hearing Isn't Believing

Monday, Feb. 1, 1999

"Gentlemen! We have called you together to inform you that we are going to overthrow the United States government." So begins a statement being delivered by Gen. Carl W. Steiner, former Commander-in-chief, U.S. Special Operations Command.

At least the voice sounds amazingly like him.

But it is not Steiner. It is the result of voice "morphing" technology developed at the Los Alamos National Laboratory in New Mexico.

By taking just a 10-minute digital recording of Steiner's voice, scientist George Papcun is able, in near real time, to clone speech patterns and develop an accurate facsimile. Steiner was so impressed, he asked for a copy of the tape.

Steiner was hardly the first or last victim to be spoofed by Papcun's team members. To refine their method, they took various high quality recordings of generals and experimented with creating fake statements. One of the most memorable is Colin Powell stating "I am being treated well by my captors."

http://www.washingtonpost.com/wp-srv/national/dotmil/arkin020199.htm

Obama didn't take any oath of office. It'll be interesting to see how they handle the situation this time around.