Via Information Aesthetics.

The "Forest of Advocacy," a visualization of political contribution data, is a "project of the LazerLAB and the Northeastern Centers for Computational Social Science and Digital Humanities (NECSS/NEDH)" at Northeastern University. The video below explains the visualization, which you can explore at their website.

From now until the November 2012 US elections, LazerLAB and company will post one visualization a week derived from political data. What's really great about the project is the thorough video explanation they provide alongside the visualization.