You want links? Howard has links aplenty. Abby Thernstrom, Pam Karlan, and Rick Pildes wrote about the case at an online forum at the NY Times. All three contributions are well worth reading.
See also this Washington Post editorial. In that editorial, the newspaper board writes: “Republicans, including former Senate Majority Leader Bob Dole and former attorney general Richard L. Thornburgh, filed a brief that makes a compelling case for upholding Section 5. It notes that between 1982 and 2006, often under Republican presidents, the Justice Department rejected 700 requests for voting changes from covered states after concluding that they were discriminatory.” Although I remain a supporter of the constitutionality of the Act, I’ve written why I believe that reliance on DOJ objections to prove unconstitutional discriminatory intent is problematic. (The challengers to the law cited my research on this point in their briefs.)
More after I have had a chance to listen to the audio of the argument.