SPRINGFIELD — Illinois House Speaker Michael J. Madigan didn’t have any primary election opponents this year.But he’s still fighting an election battle from two years ago.A federal judge last week refused to throw out claims that the long-time incumbent put “sham” candidates on the ballot in 2016 to dilute the vote and hinder his opponent, Jason Gonzales, from gaining steam in a race for the 22nd House District seat.U.S. Judge Matthew F. Kennelly last week did toss all of Gonzales’ state …