In 2019 and 2020, Illinois will be observing the semicentennial of the sixth Illinois Constitutional Convention and of its product, the 1970 Illinois Constitution. This is the first of three columns describing how the process of holding the convention and electing members of the convention came about.When Illinoisans voted to hold a constitutional convention on Nov. 5, 1968, the shape of the convention was not a foregone conclusion. The 1870 Constitution set forth the basic requirements for members of the convention: Two …