“The U.S. Justice Department used its power under the Voting Rights Act to halt the Texas law, saying in a letter to the state today that the measure may disproportionately harm Hispanics. The department in December blocked a similar law in South Carolina (NFSESC).”

URL: 
http://www.bloomberg.com/news/2012-03-12/texas-voter-identification-law-is-blocked-by-justice-department-as-biased.html