On Election Day 2008, an amazing 25 percent of Barack Obama voters were already directly linked to him through social media, including blogs, Facebook, Twitter, and other social sites according to The Nation.
Putting aside politics and just considering the election from a marketing standpoint, I am absolutely convinced that Obama won the U.S. presidential election because he was the candidate who most strongly embraced new marketing. Way back before he even declared himself a candidate, Obama and his staff and volunteers jumped into the online world.
via David Meerman Scott’s blog Web Ink Now: How the Obama campaign worked with bloggers.