Changes from the last rev:

• Includes contribution ammounts and names of contributors. (they're the green boxes)
• mouse-over on graph edges show dollar contribution ammounts.
• defaults to one degree of separation. There are just way too many nodes now that contributors are in there too.
• little blue superscripts that indicate hidden node counts are now shown only on mouseover.
• color changes: senators are orange, committees are blue.

Next time around, I'd like to add a properties pane to show details on the selected node like photographs for senators, political party membership and so on. Also totals for funds raised, and funds contributed for senators and contributors, respectively.