From Seth Lipsky of the New York Sun:
The case — known as Evenwel v. Abbott — is arising from Texas. It’s about whether voting power has to be apportioned equally by general population or by eligible voters. The impact could extend way beyond the Lone Star State, shifting political power away from cities.
Particularly cities with relatively high, non-voting immigrant populations like — oh, say — New York. The case has the potential to require authorities to strip away during the redistricting process population that isn’t eligible to vote — undocumented aliens, felons, children.
Edward Blum is the conservative constitutional sage who heads the Project on Fair Representation, which provided counsel in this case. He tells me the Nine could force redistricting. The court could, he said, “help upstate New York districts dramatically.”
Not just upstate. Mr. Blum reckons the case could lead to changes in city councils, too. He speculates that council districts in such big cities as New York, Houston and Chicago are among the “most mal-apportioned” in the country.Here's a link to an amicus brief that gives some of the argumentation.