11. December 2008
In my (somewhat less than) humble opinion, this oration was the tipping point in the Obama campaign. This was the speech that spread around the internet and got the world on his side. This was the speech that provided filip to the US to get off their no doubt flabby behinds to vote and make a difference. This was the time to repeat a catch phrase to get the crowd baying at his heels. Find 13 mins and 9 sec to watch it.
From a presentation style point of view, watch how he uses his voice. Crescendo, diminuendo. Captivating.
Bonus link: Martin Luther King's "I have a dream". If you're short for time just watch the last 4 mins.