For NYC's Mayor Election of 2013, the location/amount data of each and every contribution. As of August (2012), the candidates were Quinn, deBlasio, Liu, Allon, Stringer, and Thomposon Jr. Since the street level data was few and far between, I grouped them by zip code (because that was nearly always available). Joining them together with the FIPS geo coordinates, I was able to map them as I so pleased.