Section 2 of the Voting Rights Act, which prohibits racially discriminatory voting practices, will have its day in court when a judge hears a challenge to Wisconsin's voter ID law. The Advancement Project and pro bono counsel from the firm Arnold & Porter will argue against the requirement, implemented in 2011, on Nov. 4.

"After Shelby, Section 2 provides one of the last lines of defense against legislatures that would disenfranchise voters of color," said Advancement Project co-director Penda Hair. "Yet we are witnessing the greatest assault on voting rights in decades."

According to the Advancement Project, evidence shows that 28,000, or 16 percent, of African-Americans in the state do not have a driver's license or state ID, compared to 9.3 percent of whites.

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