South Dakota state courts must quickly decide whether or not five petitions have enough valid signatures. These petition challenges all relate to whether certain candidates should be on the primary ballots of the Republican and Democratic Parties. One challenge concerns a congressional candidate, and the others to legislative candidates. The primary is June 5. See this story. One case has already been adjudicated, and the candidate was found to lack four valid signatures.
Letting people, potentially political or party opponents ‘challenge’ ballot access petitions just seems so incredible suspect on its face.