Proving that where there’s a will there’s a way, Eyebeam as created an easy-to-use tool that shows which of our neighbors have contributed (and how much) to presidential candidates. These data are current as of 31 December 2003; they are publicly available from the Federal Election Commission (which presents “just the facts” thank you very much).
Their national map is color-coded by party and allows you to zoom to country, state or 3-digit zip code. Another “pre-set” query shows data for the top 10 donating cities.
Candidates also report spending, and Eyebeam has charts for hotels and airlines.
Thanks to Dan Gillmor