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Observation saved Nov 4, 2026, 11:35 AM UTC. No automatic updates.
IL-09 House winner?
The selected contract has a verified final result.
Final: Yes
Settled Nov 4, 2026, 2:32 AM UTC

Daniel Biss
Democratic candidate for U.S. House in Illinois
General Election
Voters choose the office holder.
Saved odds — IL-09 House winner?
Prediction-market probability saved with this edition; no automatic updates.
99%chance to win
Candidate Overview
Key details about the candidate’s background, party, office sought and current campaign.
Current roleFormer State Senator
PartyDemocratic
Political ideologyProgressive Democrat
Age49 years old (Aug 27, 1977)
GenderMale
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LocationIllinois
BackgroundPolitician
EducationHarvard University — B.A., Mathematics (1998)
Notable personal detailsDaniel Kálmán Biss is an American mathematician and Democratic politician who has served as mayor of Evanston, Illinois since May 10, 2021. He previously represented the 17th District in the Illinois House (2011–2013) and the 9th District in the Illinois Senate (2013–2019). Before elected office, he was an assistant professor of mathematics at the University of Chicago.
SourcesShowHide
Political Positions
Economy & Taxes
Supports replacing Illinois' flat income tax with a graduated (progressive) income tax, advocates additional taxes on high-end financial transactions and taxing wealthier retirement income while pursuing property-tax reform to reduce burdens on middle- and working-class homeowners.
Healthcare
Supports a national single-payer health system such as Medicare for All and advocates for universal coverage. Campaign materials and past statements commit to pursuing single-payer policies and protecting coverage for people with pre-existing conditions.
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Immigration & Border
Supports limits on federal immigration enforcement at the local/state level and policies to protect immigrant communities; has condemned ICE/Border Patrol raids in Evanston and directed local actions to investigate and shield residents. Has previously co‑sponsored state legislation (the TRUST Act) to restrict local cooperation with federal immigration enforcement and to create protected spaces for immigrants.
Abortion & Reproductive Rights
Supports legal access to abortion and has a record of championing and bolstering abortion rights in Illinois; positions and endorsements describe him as a pro-choice, progressive defender of reproductive access.
Climate & Energy
Supports aggressive federal action to confront the climate crisis, including investing in clean energy, holding polluters accountable, and advancing building- and community-level measures to reduce emissions. Emphasizes transitioning to clean energy while prioritizing jobs, affordability, and public health.
Public Safety & Guns
Supports broad, progressive gun-safety measures including repeal of the Second Amendment, universal background checks, a federal assault-weapons ban and limits on high-capacity magazines, expanded red-flag laws, safe-storage requirements, and ending legal immunity for the gun industry.
Latest News
Daniel Biss has won the Democratic primary in Illinois’ 9th Congressional District and will move on to the general election against Republican John Elleson. His victory came in a closely watched race marked by heavy outside spending and intraparty debate over AIPAC-related money. Biss also drew support from prominent Democrats, including Tammy Duckworth and Elizabeth Warren, and Jan Schakowsky backed him after withdrawing support from another candidate over AIPAC funding concerns.
Latest Polls
Recent polling results and the candidate's current average in the race.

Aggregation source: FiftyPlusOne
Campaign Fundraising
Latest report: Cycle 2026Campaign finance totals from the latest available reporting period.
2026
LatestCycle 2026
Source: FEC
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- Endorsements


