This Chicago Tribune story says that Val Montgomery, Democratic nominee for state legislature in DuPage County, Illinois, is on the ballot for the 41st State House district. But a few days ago, it was discovered that her residence is actually in the 49th district, so if she wins, she will be ineligible. The county elections department made the error. If she chooses to withdraw, the party can replace her, even though the ballots have already been printed. If she doesn’t withdraw, and she wins, she won’t be seat unless she is appointed.