Both major parties have selected their nominees for the January 28 special election to in Iowa Senate district 35. Central DeWitt school board president Mike Zimmer was unopposed at the Democratic Party’s special nominating convention on December 30. Clinton County activist Katie Whittington prevailed in a three-way competition at the GOP special convention on January 4.

Iowa House Republican Tom Determann, who has represented House district 69 (the Clinton area) since 2023, and Clinton County farmer Dennis Campbell also competed for the GOP nomination.

Whittington has never held elective office but has volunteered for various causes locally, including Donald Trump’s presidential campaign. She describes herself as a “health freedom advocate” and has been active with the anti-vaccine organizations Children’s Health Defense and Health Freedom Iowa, for which she has served as vice president.