http://www.designing-obama.com/ => I snagged the PDF when it was still free. EDIT: Still free. See responses.

VSA Partners on the Logo:

Part One: http://www.youtube.com/watch?v=etEP1Bhgui0

Part Two: http://www.youtube.com/watch?v=ukIMW833EPE

There's a ton of info out there on Obama's campaign, it's really one of the best branding and marketing success stories.