For some lawmakers who have served for more than 15 years, retirement might be their next big milestone. For Sen. Jacqueline Collins, graduating from law school is hers.The Chicago Democrat majored in journalism at Northwestern University and is a graduate of Harvard’s John F. Kennedy School of Government and the Harvard Divinity School. In two years, she will also be a graduate of the Loyola University Chicago School of Law.“I feel that I’ve always been a life learner and I’m always open to new …