In a 5-4 decision, the justices approved the use of an independent commission in Arizona.
The court said too many black voters had been packed into the 3rd District.
A bipartisan duo in the House has introduced legislation to ensure independent redistricting commissions stay in place amid a pending Supreme Court case.
The justices questioned whether black voters are spread across enough districts.
The 5-4 decision saw Justice Anthony Kennedy siding with the more liberal justices.
During oral arguments the court appeared skeptical of such a commission in place in Arizona.
Benjamin Goad 06/02/14 10:24 AM EDT
The state’s GOP-controlled legislature is accused of racial gerrymandering.
A federal court imposed a new congressional map for Kansas, bringing the redistricting process to an end
The Department of Justice gave its approval Monday to Florida's new congressional map, while a circuit court rejected Democrats' injunction request — a double whammy for Democrats who argue the new map unfairly favors Republicans.
The Obama administration's pre-clearance was required under the Voting Rights Act, which requires that states with a history of racial discrimination have their maps approved to ensure that minorities are not denied proper representation.
"The Attorney General does not interpose any objection to the specific changes" to the maps, Assistant Attorney General Thomas Perez wrote Monday in a letter to members of Florida's state government.
Democrats are expected to gain a few seats under the new map, which includes two new districts created after the 2010 U.S. Census as a result of rapid population growth in Florida.
But Republicans will likely maintain the upper hand. Nineteen of the 27 members of the congressional delegation are Republicans in Florida, a state that had 600,000 more registered Democrats than Republicans in 2010.