Steve Cohen announced his retirement after the Tennessee legislature redrew his Memphis-based congressional district to favor Republicans.The new map splits the previous majority-Black 9th District into three separate areas, significantly reducing the chances for a Democratic victory.Governor Bill Lee signed the redistricting plan into law following a Supreme Court ruling that weakened federal Voting Rights Act protections.While Cohen intends to challenge the legality of the new boundaries in court, he has formally suspended his reelection campaign for the current cycle.