The U.S. Supreme Court unanimously declined to rule on the merits of a gerrymandering case that challenged the constitutionality of redrawing congressional district maps to favor a political party in elections.Former CHANGE Illinois director Ra Joy said it was a setback for foes of the contentious, partisan way legislative districts are drawn, but not a defeat.“Advocates for fair maps are disappointed but by no means defeated. While the court today failed to establish a standard when it comes to partisan …