Online politics is neither limited to “clicktivism” nor comprised of “organizing without organizations.” In this Democracy Seminar, David Karpf highlights key findings and ongoing puzzles regarding the nature and scope of the “MoveOn Effect” in American politics. He presents evidence that the new media environment has given rise to a new generation of political advocacy groups that have redefined membership and fundraising regimes. They have established novel tools for gauging supporter opinion and pioneered nimble mobilization tactics that keep pace with the accelerated media cycle.