How have politically engaged organizations used the web to fundamentally change how people organize and engage politically? Why are left wing organizations more likely to succeed in organization online? Why are conservatives less funny than liberals?

David Karpf chronicles the dozens of Netroots political organizations, both progressive and conservative, that have sprouted up with the mass adoption of the internet in his new book The MoveOn Effect: The Unexpected Transformation of American Political Advocacy.

On this 2012 election-themed episode of Radio Berkman he speaks with our host David Weinberger about how these organizations are having an impact on politics.