2008 Presidential Campaign Finances
This interactive infographic from the New York Times website is really impressive. Using weekly data reported by the Federal Election Commission, it plots the contributions on a map of the U.S. and sizes the bubbles based on contributions from that city. It has data from every week since January 1st, so it will also "play" and animated version showing the contribution as time progresses (similar to the Trendalyzer that Google purchased from GapMinder).
You can also search for specific contributors to see which candidate campaigns they have contributed to, and how much they gave.