Richard Hansen writes in Slate about the demise of the phony fraud squad–the American Center for Voting Rights [ACVR]-
The death of ACVR says a lot about the Republican strategy of raising voter fraud as a crisis in American elections. Presidential adviser Karl Rove and his allies, who have been ghostbusting illusory dead and fictional voters since the contested 2000 election, apparently mounted a two-pronged attack…
Brad at the Brad Blog has covered the scam from the start with special attention to chief scamster Mark “Thor” Fernlund Hearne, II [national election counsel to Bush-Cheney '04]. Hearne now shows no affiliation with the ACVR [except we have the Internets] that connects how loyal Bushie Hearne tried to bushwhack democracy and the rule of law.

Project Vote a nonpartisan, nonprofit, organization has released a study on the Politics of Voter Fraud by Lorraine Minnite of Columbia University that details the trickery.
Also, as Hansen points out, see the Brennan Center’s work which debunks ACVR’s claims of polling-place voter fraud.on voter fraud.