When I think of music videos on YouTube that went viral and helped a political candidate, the first example I think of is will i am's "Yes We Can" video.

Here's an excerpt from an article about this video:

New Celeb Filled Music Video for Obama
Feb 2, 2008 ABC News Politics
Celebrity-filled music videos have been used to support many social movements, from famine relief for Africa, to support for American farmers, to opposition to apartheid in South Africa.

But rarely have celebrities and musicians banded together to create new music in the heat of a presidential campaign.

The Black Eyed Peas' frontman, songwriter and producer known as will.i.am, along with director and filmmaker Jesse Dylan, son of another socially active musician, Bob Dylan, released a new song Friday that attempts to do just that...
The music video "Yes We Can" premiered on ABCNewsNow's "What's the Buzz" on Friday. It was inspired, will.i.am told ABC's Alisha Davis, by Sen. Barack Obama's presidential campaign and in particular by the speech he has gave after the New Hampshire primary.

The music video includes excerpts from the Obama speech and appearances from a range of celebrities...

Dylan and will.i.am say they did not coordinate the production or release of this video with the Obama campaign and the filmmakers say they don't even know if Obama is aware of the video.

'We didn't talk to anybody there... We just came together because it was an inspirational song about change coming out of his speech'".
Dylan said...

http://a.abcnews.com/Politics/story?id=4231523&page=1