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Adam Miller faces challenge from Don Leonard in 15th District
Don Leonard is a political figure challenging Adam Miller in Ohio’s 15th House District race.
Updated Oct 16, 2026, 2:28 PM ET
Don Leonard, a Democrat, is his party's nominee for Ohio's 15th congressional district in 2026 after defeating former state representative Adam Miller, and faces Republican incumbent Mike Carey.
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2026 race
Don Leonard is the Democratic nominee for Ohio's 15th congressional district, which encompasses the southwestern Columbus metro area, including Dublin, Hilliard and Grove City. The seat is held by Republican incumbent Mike Carey, who was re-elected with 56.5% of the vote in 2024.
In the Democratic primary, Leonard won 52.9% of the vote, defeating Adam Miller, a former state representative and the party's nominee for the district in 2024, who took 47.1%. In the general election on November 3, 2026, Leonard faces Carey and Libertarian Brennan Barrington, an engineer.