On March 27, a U.S. District Court set a date for a jury trial in Gonzales v Madigan, n.d. 1:16cv-7915. This is a lawsuit filed in 2016 around the Illinois Democratic primary for Representative, 22nd district, in Chicago. Speaker Michael Madigan represents that district. In 2016 Jason Gonzales filed to run against Madigan. Madigan then allegedly recruited two other candidates with Hispanic surnames to file in that primary. Madigan won that primary against his three opponents.
In the Seventh Circuit, there was a precedent that recruiting sham candidates violates the U.S. Constitution. Gonzales filed a lawsuit to invalidate the primary. It is now a very old case, but it is moving forward.
IMO, ranked choice or approval voting would minimize the impact of sham candidates