I just finished a visualization for my second assignment at Berkeley. It was made using Tableau, a rapid-visualization application, and Photoshop. You can read more about the process behind it.
Presidential campaign contributions made by individuals during the 2007-2008 election cycle, by political party and contributor location
Using FEC data of individual contributors to presidential election campaigns, this bar chart illuminates that both California- and San Francisco-based individuals give significant portions of the total amounts received by campaigns of each party. It is also clear that Democratic campaigns have received over 1.5 times as much as Republicans in this election cycle, at the national, state, and city levels. Contributions to Independent and Libertarian campaigns barely even register in comparison, and Green ones not at all.