John Fund addresses voter fraud in general and ACORN's contribution thereto in particular:

[In] Seattle ... local prosecutors indicted seven workers for Acorn, a union-backed activist group that last year registered more than 540,000 low-income and minority voters nationwide and deployed more than 4,000 get-out-the-vote workers. The Acorn defendants stand accused of submitting phony forms in what Secretary of State Sam Reed says is the "worst case of voter-registration fraud in the history" of the state.

Local officials refused to accept the registrations because they had been delivered after last year's Oct. 7 registration deadline. Initially, Acorn officials demanded the registrations be accepted and threatened to sue King County (Seattle) officials if they were tossed out. ... Of the 1,805 names submitted by Acorn, only nine have been confirmed as valid, and another 34 are still being investigated. The rest--over 97%--were fake.

But ACORN gets off with a very light slap on the wrist:

In Washington state, King County Prosecutor Dan Satterberg said that in lieu of charging Acorn itself as part of the registration fraud case, he had worked out an agreement by which the group will pay $25,000 to reimburse the costs of the investigation and formally agree to tighten supervision of its activities....

From disenchanted ACORN employees (recall ACORN's strongly pro-union stance on issues):

Last year several Acorn employees told me that the Acorn scandals that have cropped up around the country are no accident. "There's no quality control on purpose, no checks and balances," says Nate Toler, who was head of an Acorn campaign against Wal-Mart in California until late last year, when Acorn fired him for speaking to me.

Loretta Barton, another former community organizer for Acorn, told me that "all Acorn wanted from registration drives was results." Ironically, given Acorn's strong backing from unions, Ms. Barton alleges that when she and her co-workers asked about forming a union, they were slapped down: "We were told if you get a union, you won't have a job." There is some history here: In 2003, the National Labor Relations Board ordered Acorn to rehire and pay restitution to three employees it had illegally fired for trying to organize a union.