With Election Day weeks away, top Republican donors have funneled more than $2.5 million to unseat one of four Democratic justices on the Illinois Supreme Court, and potentially seize control from the court’s Democratic majority, which has lasted since 1964.Justice Thomas L. Kilbride faces an anti-retention effort from the Citizens for Judicial Fairness, a committee that formed last month and is chaired by James Nowlan, a political commentator, a former state legislator and a former University of Illinois at Champaign …