They are saying that the new districts violate the Voting Rights Act:

The Justice Department said Monday that Texas’ state House and congressional redistricting plans didn’t comply with Section 5 of the Voting Rights Act (VRA), indicating they thought the maps approved by Gov. Rick Perry (R) gave too little voting power to the growing Latino population in the state.

Officials with DOJ’s Civil Rights Division said the proposed redistricting plan for the State Board of Education (SBOE) and the state Senate complied with the Voting Rights Act, but indicated they had concerns with the state House plan and the plan for congressional redistricting.

The federal government “[denied] that the proposed Congressional plan, as compared with the benchmark, maintains or increases the ability of minority voters to elect their candidate of choice in each district protected by Section 5,” DOJ lawyers write in a filing. “Defendants deny that the proposed Congressional plan complies with Section 5 of the Voting Rights Act.”

For all I complain about Obama, the fact that the professional staff in the DoJ’s civil rights division are allowed to do their jobs is an improvement over Bush and His Evil Minions^™.