Other
Opensecrets.org: 2008 Presidential Election Fundraising
Find out all the campaign finance information at this thoroughly comprehensive site. If you want to know who's giving what, how much each candidate is getting, and where the money is coming from, this is the place to look.
Harry S. Truman Library and Museum
Every Four Years: Electing a President
This exhibition examines Presidential elections, with a particular emphasis on elections in the last 80 years.