Nathan Yau points out the Wall Street Journal’s “Political Moneyball” visualization in Network of political contributions.
You will probably benefit from starting with Nathan’s comments and then navigating the WSJ visualization.
I like the honesty of the Wall Street Journal. They have chosen a side and yet see humor in its excesses.
Nathan mentions the difficulty with unfamiliar names and organizations.
An example of where topic maps could enable knowledgeable users to gather information together for the benefit of subsequent, less knowledgeable users of the map.
Creating the potential for a collaborative, evolutionary information resource that improves with usage.