"Visualizing Contributions to the 110th Congress"
Usually, I quote a little portion of the article, but these are primarily visual, so I will just give you the links.
Visualizing Contributions to the 110th Congress — The House Edition
Visualizing Contributions to the 110th Congress—House Edition (Take 2)
Visualizing the Campaign Contributions to Senators in the 110th Congress — The TARP EDITION