Daniel Biss
Won the 2026 race for Illinois's 9th District.
Born 1977Mathematician
- Last margin
- +52.4
- Won 2026
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 11:01 PM ET
Background
As listed by the official candidate list, Wikidata and campaign filings. 99chambers does not summarize platforms or endorsements.
- Born
- 1977 · Akron, Ohio
- Education
- Harvard University; Massachusetts Institute of Technology
- Occupation
- mathematician, topologist
- On the ballot as
- mayor of Evanston (2021–present), state senator from the 9th district (2013–2019), and candidate for governor in 2018
Source: Wikidata (CC0) and the official candidate listUpdated Oct 27, 2026, 11:01 PM ET
Every race Biss has run
Baseline: how the seat voted for president in the same or nearest year. Running ahead of it means Biss won voters the party’s presidential nominee did not; primaries have no baseline.
| Year | Office | Stage | Result | Opponents | Share | Margin | Raised | Baseline | Against baseline |
|---|---|---|---|---|---|---|---|---|---|
| 2026 | Illinois's 9th District | General | Won | John Elleson (R) | 76.2% | D+52.4 | $3.4M | D+36.9 |
Source: 99chambers results archive; 2026: civicAPI (unofficial)Updated Nov 8, 2026, 7:01 PM ET
Money
Biss’s campaign fundraising, and outside money in Biss’s races this cycle.
- Raised, 2025–26
- $3.4M
- Outside, for Biss
- $1.2M
- Outside, against Biss
- $1.4M
Source: FEC filings through Oct 14, 2026Updated Nov 3, 2026, 2:14 AM ET
What’s next
From campaign filings, not from public statements.
| BISS FOR CONGRESS FEC | Active |
Source: FEC filings through Oct 14, 2026Updated Nov 3, 2026, 2:14 AM ET
Who Biss has run against
- John Elleson (R) · 2026 general, won
Source: 99chambers results archive; 2026: civicAPI (unofficial)
The seat
- Illinois's 9th District · lean D+38.2 · 61st most Democratic of 435
FEC H6IL09228 · Wikidata Q3013758
Source: 99chambers: presidential results on current lines (MEDSL precinct returns); Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 11:01 PM ET