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D Democratic · U.S. House 15, Ohio · Nov 3, 2026

Don
Leonard

Democratic challenger Don Leonard, a former Ohio State planning professor, is running against incumbent Rep. Mike Carey in Ohio's 15th Congressional District in 2026.

Background

Don Leonard is the Democratic candidate challenging incumbent Republican Rep. Mike Carey in Ohio's 15th Congressional District in the November 3, 2026 general election. He has never previously held elected office. 124

Leonard served two years in the U.S. Peace Corps in South America after college, later earning degrees in political science and regional development from the University of Massachusetts Lowell and a Ph.D. in government from Cornell University. He subsequently completed postdoctoral work at Tulane University. 124

For roughly a decade, Leonard taught city and regional planning at The Ohio State University. He stepped down from that position in early 2026 to pursue his congressional campaign full-time. His campaign is based in Columbus, Ohio. 16

Leonard describes himself as "a proud Democrat" and is running on a platform focused on issues affecting central Ohio. 1

At a glance

Party
Democratic
Running for
U.S. House · District 15, Ohio
Election
Nov 3, 2026
Website
donforohio.com(opens in a new tab)

Where they stand

Each position links to the page it was drawn from. Quotes are verbatim.

Timeline

  1. Oct 9
    news
    Reuters reports Leonard raised ~$600,000 vs. Carey's $3.3 million through June 30

    Federal FEC figures cited in a Reuters report showed Leonard had raised approximately $606,658 (mostly from individual contributors) with $252,402 cash on hand through June 30, compared to Carey's $3.3 million (more than half from PACs).

    Could GOP troubles put Carey's seat in play? It'd take a giant blue wave · Oct 9, 2026 (opens in a new tab)
  2. Oct 9
    news
    Republican super PAC spends ~$320,000 on opposition ads against Leonard

    By October 9, Republican super PAC Defending Main Street had spent about $320,000 on opposition ads against Leonard, according to Reuters. The ads highlighted Leonard's March arrest. National Democratic strategists were also reportedly considering additional spending against Carey.

    Could GOP troubles put Carey's seat in play? It'd take a giant blue wave · Oct 9, 2026 (opens in a new tab)
  3. Oct 5
    news
    Leonard outlines policy platform in WOSU interview, calls himself a 'Do Something Democrat'

    In a WOSU interview, Leonard described affordability—health care, childcare, homeownership, and aging—as his top four issues. He backed a Medicare public option, a national universal-childcare model, replacing ICE, and federal rules on data-center siting. He also called for a constitutional amendment to remove corporate and foreign-lobby money from politics, opposed congressional stock trading, and said he would not back Hakeem Jeffries for Speaker if Jeffries failed to reinvent the Democratic Party.

    'Do Something Democrat' Don Leonard hopes to flip the script in ... · Oct 5, 2026 (opens in a new tab)
  4. Sep 30
    news
    Sabato's Crystal Ball shifts OH-15 rating from 'Safe Republican' to 'Likely Republican'

    In late September, Sabato's Crystal Ball shifted its rating of Ohio's 15th District from 'Safe Republican' to 'Likely Republican,' reflecting increased competitiveness. Cook Political Report also rated the district 'Likely Republican.' Crystal Ball editor Kyle Kondik said Leonard would need 'a lot of things to go right to win.'

    Could GOP troubles put Carey's seat in play? It'd take a giant blue wave · Oct 9, 2026 (opens in a new tab)
  5. Sep 22
    poll
    Poll shows Leonard and Carey effectively tied at 46%-45% in OH-15

    A Hart Research Associates poll of 500 likely voters conducted around September 22–24 showed Leonard at 46% and Carey at 45%. The poll was listed by Election.org; no margin of error or commissioning source was provided, and the result could not be independently verified.

    2026 Ohio District 15 U.S. House Election: Polls, Candidates, Money & Dates | Election.org · Sep 22, 2026 (opens in a new tab)
  6. Sep 16
    endorsement
    AFGE endorses Leonard for Ohio's 15th Congressional District

    The American Federation of Government Employees, the largest federal employee union, announced its endorsement of Don Leonard in the OH-15 race.

    Largest Federal Employee Union Endorses Ohio Rep. ... · Sep 16, 2026 (opens in a new tab)
  7. May 5
    filing
    Leonard wins Democratic primary in OH-15, defeating Adam Miller

    Don Leonard won the Democratic nomination in the May 5 primary, defeating Adam Miller, to become the Democratic challenger to Republican incumbent Mike Carey in Ohio's 15th Congressional District.

    Could GOP troubles put Carey's seat in play? It'd take a giant blue wave · Oct 9, 2026 (opens in a new tab)

Endorsements

  • CAIR Ohio organization
    Listed among Leonard's endorsers in an iVoterGuide profile; no dated primary announcement found in the sources reviewed. ivoterguide.com
  • Planned Parenthood Action Fund organization
    Listed on the Action Fund's 2026 endorsements page; Leonard also referred to the endorsement in a WYSO interview published October 5, 2026. plannedparenthoodaction.org
  • Ohio Federation of Teachers union
    Listed on the Ohio Organizing Campaign's candidate page; no endorsement date given. ohioorganizingcampaign.org
  • Ohio AFL-CIO union
    Listed among Leonard's endorsers in an iVoterGuide profile; no dated primary announcement found in the sources reviewed. ivoterguide.com
  • College Democrats of Ohio organization
    Listed by Smarter.Vote based on a College Democrats of Ohio Instagram endorsement; exact date not established. smarter.vote
  • Planned Parenthood Advocates of Ohio organization
    Listed on the Ohio Organizing Campaign's candidate page; no endorsement date given. ohioorganizingcampaign.org
  • Ohio Education Association (OEA) organization
    OEA's 2026 election guide lists 'Don Leonard (D)' among recommended candidates for Congressional District 15. Guide updated September 19, 2026. ohea.org
  • Franklin County Young Democrats organization
    Listed by Smarter.Vote based on a campaign Instagram endorsement; exact date not established. smarter.vote
  • Stand Up for Science organization
    Stand Up for Science named Leonard among its endorsed congressional candidates in a press announcement. einpresswire.com · Oct 2, 2026
  • American Federation of Government Employees (AFGE) union
    AFGE announced its endorsement of Leonard for Ohio's 15th District, describing itself as the largest federal employee union. afge.org · Sep 16, 2026
  • End Citizens United organization
    End Citizens United announced its endorsement and said Leonard was part of its Unrig Washington program. endcitizensunited.org · Jun 18, 2026

Campaign finance

Totals filed with the Federal Election Commission for the 2026 election cycle.

Raised
$607K
Spent
$354K
Cash on hand
$252K

As of Jun 30, 2026. Filings are periodic, so recent money may not be included yet. ↳ FEC record H6OH15112(opens in a new tab)

Sources 15

  1. [1] Don Leonard (D) – OH-15 House 2026 | Smarter.Vote(opens in a new tab) Oct 10, 2026
  2. [2] 2026 Planned Parenthood Action Fund Endorsed Candidates(opens in a new tab) Oct 9, 2026
  3. [3] Could GOP troubles put Carey's seat in play? It'd take a giant blue wave(opens in a new tab) Oct 9, 2026
  4. [4] Voter Guide Profile for OH U.S. Rep., Dist. 15 candidate - Don Leonard(opens in a new tab) Oct 9, 2026
  5. [5] Meet the candidates in Ohio's 15th Congressional District ...(opens in a new tab) Oct 6, 2026
  6. [6] 'Do Something Democrat' Don Leonard hopes to flip the script in ...(opens in a new tab) Oct 5, 2026
  7. [7] Stand Up for Science Endorses Pro ...(opens in a new tab) Oct 2, 2026
  8. [8] 2026 Ohio District 15 U.S. House Election: Polls, Candidates, Money & Dates | Election.org(opens in a new tab) Sep 22, 2026
  9. [9] Congressional District 15 — Ohio Organizing Campaign(opens in a new tab) Sep 21, 2026
  10. [10] 2026(opens in a new tab) Sep 19, 2026
  11. [11] Largest Federal Employee Union Endorses Ohio Rep. ...(opens in a new tab) Sep 16, 2026
  12. [12] Largest Federal Employee Union Endorses Ohio Rep. ...(opens in a new tab) Sep 16, 2026
  13. [13] End Citizens United Endorses Don Leonard for Ohio's 15th ...(opens in a new tab) Jun 18, 2026
  14. [14] OH-15 Congressional Democratic Primary Candidate Don ...(opens in a new tab) Mar 6, 2026
  15. [15] Don Leonard — official campaign website(opens in a new tab)
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