According to 360i's David Berkowitz, during the 2004 election both John Kerry and George Bush were victims of Google bombs, being linked to words and phrases like "waffle" and "miserable failure," respectively.

The idea is to cross-post the links so often that they move up in rank within Google's algorithm. By flooding the Web with real news articles, mostly negative coverage, when users search for a candidate they will be hit with the unsavory.

Chris Bowers, liberal blogger for My Direct Democracy, conceived the plan to bomb 50 Republican candidates and has posted on his blog detailed instructions on how to participate in the bomb, updates on each candidate's ranking in the bomb, and ways to improve for the next time (2008).

Google officials have issued a statement saying that they do not condone the practices and believe that the company’s system is too sophisticated to be gamed as such. However, that hasn’t stopped Republican John Hawkins, of Rightwingnews.com, from posting a counter-attack to “fight fire with fire.” He has posted  a list of key races for Republican blogs to bomb.

Search engines are free, universal, and easy to use and with many voters turning to the Internet to get information on candidates this has the potential to make an impact on the 2006 elections and, if Bowers and Hawkins are successful, the 2008 election as well. 

 Source:
A New Campaign Tactic: Manipulating Google Data

Google Bombing Politicians