The Chicago Bar Association today turned over the reins to a deputy Illinois governor, a former city and state education board leader and a former partner at Drinker Biddle & Reath LLP.But Jesse H. Ruiz highlighted another part of his biography when he took the gavel from Steven M. Elrod at the CBA annual meeting Tuesday: son of an undocumented immigrant.His father picked crops in the West, then moved to Chicago and …