On December 30, Iowa held a special election for State Senate, 12th district. The results: Republican Mark Costello 74.41%; Democrat Steven Adams 22.41%; Libertarian Don W. Brantz 3.18%. Here is a link to the returns on the Secretary of State’s web page.
This is the first time in recent decades that the Iowa Libertarian Party has run a legislative candidate in southwest Iowa. In 2012, when this seat was last up, Republican Joni Ernst was the only candidate on the November ballot. The special election was needed because Ernst resigned to take her seat in Congress.