My guys at SEO.com recently spent some time analyzing Google Trends to predict the outcome of Super Tuesday. So far the results didn't quite match up (Google showed Obama on top after Tues), but it is interesting to look at how search popularity corresponds to the actual vote. We'll be posting a follow up to compared the trends estimates with the actual results within the next few days.
I've come across a few other interesting sites with data related to the election across the web including these:
Google Map/Twittervision mashup for Super Tuesday
This article on Search Engine Land with links to how voters and candidates are using the web this election season