Proposes to amend the Legislature Article and the Executive Article of the Illinois Constitution. Provides that a person may not be elected to the office of State Senator, the office of State Representative, or any single Executive Branch office for terms totaling more than 20 years in each office. Provides that service before the date of the adoption of the amendment shall be considered in the calculation of a person's service. Provides that any person in office at the time of the adoption of the amendment who meets the specified term limitation shall be allowed to complete his or her term of office.