Voting Fraud in the USA--who did it?

You hear many stories talking about this, from the 2004 election or the 2000 election--but which are real? Are the stories just the pot calling the kettle black, or are they based in reality?
Read this article written by the bi-partisan American Center for Voting Rights (who are they?), and you may be surprised.
(Home Page) (HTML Article) (PDF Article)
The report concludes, after careful background checking and citing articles, investigations, and even court cases, the following:

While Democrats routinely accuse Republicans of voter intimidation and suppression, neither party has a clean record on the issue. Instead, the evidence shows that Democrats waged aggressive intimidation and suppression campaigns against Republican voters and volunteers in 2004. Republicans have not been exempt from similar criticism in this area, as alleged voter intimidation and suppression activity by GOP operatives led the Republican National Committee to sign a consent decree repudiating such tactics in 1982. However, a careful review of the facts shows that in 2004, paid Democrat operatives were far more involved in voter intimidation and suppression efforts than their Republican counterparts.

Hmm...Mr Pot, meet Mr. Kettle.