McClatchy newspapers offers this report. A snippet:

In November 2004, Arizona residents passed Proposition 200, the toughest state voter ID law to date, which requires applicants to provide proof of citizenship and voters to produce a photo ID on Election Day. The Voting Rights Act state requires states to show that such laws wouldn’t impede minorities from voting and gives the Justice Department 60 days to approve or oppose them.
Career voting rights specialists in the Justice Department soon discovered that more than 2,000 elderly Indians in Arizona lacked birth certificates, and they sought their superiors’ approval to request more information from the state about other potential impacts on voters’ rights. Spakovsky and Sheldon Bradshaw, the division’s top deputy and a close friend of top Gonzales aide Kyle Sampson, a former Bush White House lawyer, denied the request, said one of the former department attorneys.
Later in 2005, career lawyers wrote a memo recommending that the department oppose a new Georgia law requiring voters to present a $20 photo ID. They argued that the requirement would discriminate against poor blacks, but that was quickly rejected.
Toby Moore, one of the five career lawyers who reviewed the memo, said the only dissenter to the recommendation was a new hire, Joshua Rogers, a member of the National Republican Lawyers Association, a partisan organization interested in election issues.
Moore said that John Tanner, who’d just been appointed the new section chief, “doctored the memo … reversing many of our findings,” and used the occasion to change procedures so that he alone could make future recommendations.

See also this NY Times report, which notes a letter (reprinted here on the Brad Blog) from career attorneys complaining about hiring practices at the DOJ.