A political battle likely is looming with the announcement that another seat on the 7th U.S. Circuit Court of Appeals has become vacant.Judge Ann Claire Williams, to date the only African-American to serve on the Chicago-based federal appeals court, took senior status June 5.Sen. Richard J. Durbin called attention to Williams’ move with a statement Tuesday describing her as “an inspirational leader on the bench.”“She has served the people of Illinois and the 7th Circuit with integrity, fairness and …