The US supreme court has ruled that Louisiana will have to redraw its congressional map, in a landmark decision that effectively guts a major section of the Voting Rights Act. In a 6-3 decision along partisan lines, the court rendered ineffective section 2 of the Voting Rights Act, the last remaining powerful provision of the 1965 civil rights law that prevents racial discrimination in voting. Section 2 specifically has long been used to ensure minority voters are treated fairly in redistricting “Allowing race to play any part in government decision-making represents a departure from the constitutional rule that applies in almost every other context,” Justice Samuel Alito, a conservative, wrote for the majority opinion. “Compliance with section 2 thus could not justify the state’s use of race-based redistricting here.…