The Guardian produced a set of data that they'd collected for the results of the recent European elections, and published the data as a Google Spreadsheet.
I cloned the spreadsheet and tidied it up (HTML version), then imported it into Google Fusion Tables.
In Fusion Tables I created two separate views of the data - one showing just the number of votes for each party, and one showing the % of votes for each party.
From the Visualize menu, anyone should now be able to visualise that data in different ways: currently the sortable Table, Scatter and Bar visualisations are the most interesting; the Intensity Map would be good, but doesn't yet have enough options to present this data well.
Google's attempt to automatically geocode the location fields is interesting; there needs to be an option to limit the scope of the geocoding, perhaps.