The Chicago Tribune of July 10 has this op-ed by Bill Redpath, explaining and criticizing the Illinois ballot access laws.
Illinois has had one of the worst sets of ballot access laws for minor parties and independent candidates ever since 1931. And changes in the last forty years have made them worse. There have been some significant improvements in the last 40 years as well, but they were caused by court rulings, not voluntary legislative activity. Unlike most states, the Illinois legislature has not voluntarily made any improvements in over 90 years.