March 17 marks the 2026 primary, where voters can pull a Democratic or Republican ballot to pick who appears on the ballot come November. All voters, partisan or not, can weigh in on referendum questions.

The March 17 primary is a prelude to the November mid-term elections that will also determine the political makeup of Congress.

McHenry County Sheriff Robb Tadelman was among the countywide officeholders who filed nominating petitions Monday to run in the Spring 2026 primary election. Tadelman is seeking his second term, so far without opposition.