Illinois has the second-highest petition requirement for minor party and independent candidates for U.S. House, 5% of the last vote cast. Only Georgia is more severe. Nevertheless, four independent candidates are petitioning to get on the ballot in the 4th district in Chicago. That is because the Democratic nominee, Patty Garcia, is unpopular because of the way she got on the ballot. The incumbent, Jesus Garcia, told almost no one that he wasn’t running for re-election in the March primary, but he did tell Patty Garcia. So by the time the news spread, it was too late for other Democrats to petition for the primary ballot. Congressman Garcia was censured on the floor of the U.S. House for this behavior.
That motivated four Democrats to start independent petition drives to get on the November ballot. In addition, the Working Class Party is ballot-qualified in the Fourth District, and it is running a candidate. See this story.