Voters in six western Ohio counties vote Tuesday on who will take the congressional seat left vacant by former House Speaker John Boehner.
Republican Warren Davidson won his party's nomination in the GOP-dominated 8th House District by topping a 15-candidate primary field. Democrat Corey Foister was unopposed, and Jim Condit Jr. was nominated under the Green Party banner.
Tuesday's winner will complete Boehner's term and be in a strong position to win the general election for a full term in the next Congress.
Open seats have been rare in Ohio, which has very incumbent-friendly House districts.
Low turnout is expected for the special election, with no other races on the ballot. The secretary of state's office said Monday that nearly 3,600 ballots had been cast early.