SC-3 · House
election-day forecast · ground-up model · as of 2026-10-02
The district, in brief
South Carolina's 3rd district takes in the Piedmont area in northwestern South Carolina, including Anderson and Greenwood. The lines are the map first used in 2022 and are not redrawn for this cycle.
The incumbent is Republican Sheri Biggs, elected with 71.7% of the vote in 2024 and running for re-election; the facts list Republican Jeff Duncan as the winner from 2012 through 2022. The text gives no Republican primary results. The Democratic nominee is Eunice Lehmacher, a social worker and nominee for state representative in 2020 and 2024, who won her primary 53.4% to 46.6% over educator Ernest Mackins. A Libertarian, Brian Corriea, a navy veteran, is also standing. As of May 13, 2026 Biggs had raised $418,427 with $174,495 on hand, and Lehmacher $30,047 with $14,792 on hand.
Decision Desk HQ (July 14, 2026), the Cook Political Report (June 25, 2025), Inside Elections (June 25, 2025) and Sabato's Crystal Ball (June 25, 2025) each call the seat R. No district polls are recorded.
A paragraph quoting a model forecast from the day this brief was written is omitted; the current forecast is at the top of this page.
The facts, each beside its sentence
Incumbent Republican Sheri Biggs, who was elected with 71.7% of the vote in 2024, is running for re-election.
Sheri Biggs, incumbent U.S. representative
Eunice Lehmacher, social worker and nominee for state representative in 2020 and 2024
Sheri Biggs, incumbent U.S. representative
Eunice Lehmacher, social worker and nominee for state representative in 2020 and 2024
Sheri Biggs, incumbent U.S. representative
who was elected with 71.7% of the vote in 2024
candidate: Eunice Lehmacher party: Democratic Party (United States) votes: 16,730 percentage: 53.4
Decision Desk HQ R July 14, 2026 The Cook Political Report R June 25, 2025
Sheri Biggs (R) $418,427 $348,018 $174,495 | Eunice Lehmacher (D) $30,047 $15,254 $14,792
===Libertarian primary=== ====Nominee==== Brian Corriea, navy veteran
Ernest Mackins, educator and nominee for state representative in 2022
Not in the source: No Republican primary results are given; the text does not say whether Biggs was opposed.; The text does not state the district's presidential results; the facts give a 2024 two-party baseline only.; No district polls are given, and the model's basis says none.; Silver Bulletin is not among the raters listed for this district.; The endorsement sections are empty.
Read from the district's section of Wikipedia's state page (CC BY-SA), archived as 92fb09f11fac; written by claude-fable-5-1 (batch reader) on 2026-09-30 and checked mechanically: every quote occurs verbatim in the archived text, every number in the brief occurs in the inputs. No probability here is the reader's.
Who holds the seat now
Sheri Biggs (Republican), in this chamber since 2025, 1 term. Committees: House Committee on Science, Space, and Technology; House Committee on Homeland Security; House Committee on Foreign Affairs.
From the congress-legislators dataset (CC0), archived as ae8cb9477c48. For a Senate race this lists both of the state's senators; the one whose term ends in the election year holds the seat on the ballot. For a House district redrawn for 2026 it is the member elected under the old lines with this number, who may be running elsewhere; the dossier above names who is running here.
How it has voted for president
| Two-party margin | 2016 | 2020 | 2024 |
|---|---|---|---|
| President | R+38.5 | R+37.1 | R+42.8 |
A shift of 4.3 points toward the Republicans from 2016 to 2024. county returns placed on the current lines by 2020 block population; MEDSL county file (2016), an MIT-licensed county file (2020, checked against certified state results) and MEDSL precinct returns (2024). For a district split across counties this is an estimate, and where the state published the exact 2024 figure for these lines, that exact figure is the one the model uses.
Who are the voters?
| Group (adults 25+) | Share of adults | Turnout 2020 / midterm | Share of a midterm electorate | Est. Democratic share, 2020 |
|---|---|---|---|---|
| White, no degree | 55% | 61% / 40% | 50% | 12% |
| White, degree | 21% | 83% / 61% | 30% | 35% |
| Black | 17% | 53% / 40% | 16% | 89% |
| Hispanic | 4% | 24% / 13% | 1% | 50% |
| Asian | 1% | 68% / 20% | 0% | 56% |
| Other / multiracial | 2% | 61% / 43% | 2% | 47% |
Of about 502,185 adults 25 and over. In 2020 the district voted 31.1% Democratic (two-party) for president. With the same preferences and a 2022-style midterm turnout, it would vote 32.4% Democratic: the midterm electorate alone moves the margin 2.6 points toward Democrats. Group shares are estimated from how results vary across the state's census tracts (ecological inference, anchored to Pew's 2020 validated-voter figures) and calibrated to this district's actual 2020 vote; turnout is the Census survey's state rate by race and national rate by education, whose state samples carry margins of several points.
Not answered here: how each group will vote in 2026. These are 2020 preferences; this profile is description, not yet an input to the forecast.
The money
| Candidate | Raised | Cash on hand | PAC share | Self-funded | Outside $ for | Outside $ against |
|---|---|---|---|---|---|---|
| Biggs, Sheri (REP) incumbent | $505,333 | $218,741 | 58% | 0% | $6,344 | $0 |
| Burns, Mark (REP) open seat · not on our roster | $93,670 | $1,366 | 0% | 100% | $0 | $0 |
| Lehmacher, Eunice (DEM) challenger | $40,813 | $17,699 | 1% | 0% | $0 | $0 |
| Mackins, Ernest E. Dr (DEM) challenger · not on our roster | $1,468 | $374 | 0% | 0% | $0 | $0 |
FEC bulk candidate summaries through June 30, 2026; $6,344 of independent expenditures for or against these candidates this cycle (FEC Schedule E, types 24E and 24A), which is the parties' and outside groups' own revealed view of whether this seat is in play.
The district in numbers
| Measure | District | Nation | Difference |
|---|---|---|---|
| Bachelor's degree or higher, 25+ | 25.8% | 34.9% | -9.2 pts |
| White, non-Hispanic | 72.0% | 58.2% | +13.8 pts |
| Black, non-Hispanic | 16.9% | 12.0% | +4.9 pts |
| Hispanic or Latino | 6.0% | 19.0% | -13.0 pts |
| Asian, non-Hispanic | 1.0% | 5.8% | -4.8 pts |
| Foreign-born | 4.1% | 13.9% | -9.8 pts |
| Median age | 40.7 | 39.2 | 1.5 |
| Median household income | $60,987 | $84,362 | $-23,375 |
| Median home value | $201,900 | $379,737 | $-177,837 |
| Owner-occupied homes | 74.0% | 65.1% | +8.9 pts |
| Unemployment, July 2026 (BLS county data) | 4.0% | 4.4% | -0.4 pts |
| Change in unemployment, past 12 months | -0.8 pts | — | — |
| Change since the last election (24 months) | -0.9 pts | — | — |
| Unemployment (ACS) | 4.6% | 5.2% | -0.6 pts |
| Federal government workers | 1.5% | 2.6% | -1.1 pts |
| Work from home | 7.1% | 13.5% | -6.4 pts |
| Households on SNAP | 11.5% | 11.8% | -0.3 pts |
| Households with Social Security income | 37.3% | 31.2% | +6.1 pts |
| Households with public assistance income | 1.3% | 2.7% | -1.4 pts |
| Moved in from another state, past year | 2.9% | 2.3% | +0.6 pts |
| Gini index | 0.50 | 0.44 | 0.06 |
| Per-capita personal income (BEA), 2024 | $53,349 | $73,248 | $-19,899 |
| Per-capita income growth since 2019, nominal, 2024 | 30.5% | 32.0% | -1.5 pts |
| Government and other transfers, share of income, 2024 | 27.7% | 19.6% | +8.1 pts |
| Social Security, share of income, 2022 | 9.7% | 5.8% | +3.8 pts |
| Medicare, share of income, 2022 | 7.1% | 4.5% | +2.7 pts |
| Medicaid, share of income, 2022 | 3.3% | 4.0% | -0.7 pts |
| SNAP, share of income, 2022 | 0.8% | 0.6% | +0.1 pts |
| Earned Income Tax Credit, share of income, 2022 | 0.6% | 0.4% | +0.2 pts |
| Veterans' benefits, share of income, 2022 | 1.3% | 0.9% | +0.5 pts |
| Federal civilian jobs, share of all jobs, 2022 | 0.5% | 1.3% | -0.7 pts |
| Military jobs, share of all jobs, 2022 | 0.7% | 0.9% | -0.2 pts |
ACS 5-year 2023, the Census Bureau's own tabulation of this district (118th Congress lines). Unemployment is the BLS county series placed on the district by block population, not seasonally adjusted, so changes are same-month comparisons. Income, transfers and jobs are BEA county accounts placed the same way, compared with the average district. Every other figure is a named column of a named table in the Bureau's summary file, archived before it was read. This is what a reader knows about a district before looking at a poll; the model does not yet use it, and whether it should is a registered question.
Who is favoured, and by how much?
The 90% interval runs from -49.3 to -21.4 points, D-R. It is wide because this district has never been polled.
What is this built on?
A model trained on every contested House race 2012-2024 predicts this district's lean from its own record: presidential and House results on the current lines, incumbency, both candidates' prior offices, outside and party money before 1 October, demographics and public-assistance shares from the Census release before the election, local unemployment and income, and religious tradition. The national margin comes from presidential approval, the economy, the midterm penalty and the generic ballot corrected for its measured lean. Draws share national and state errors, so the seat total and this district come from the same simulation.
Not answered here: district polls, which are not yet folded in.
Why does the model say this?
Each figure is how far this district's predicted lean moves when that one feature is set to the typical value across 2026 districts, everything else held: 2024 presidential lean (R+42.1): 21.7 pts toward the Republican; 2024 House lean (R+45.1): 8.8 pts toward the Republican; asian share (1.0%): 0.7 pts toward the Republican; social security share income (8.5%): 0.7 pts toward the Democrat; experience gap (-4 levels, D minus R): 0.6 pts toward the Republican.
How sure is it, and of what?
Total sd 8.47 points, made of the seat's own volatility 89%, correlated polling error 11%. The decomposition is stored with the forecast rather than reconstructed, so a probability whose dominant input is a placeholder is visibly that.
Not answered here: a nowcast. 'If ballots were cast today' needs something that observes today, and for a House district nothing does. Publishing the election-day figure under both labels would make one forecast look like two.
How was this number made?
Run 0b33151b-a949-47f1-b845-564833a2b74d, house_district_prior/0.2.0, as of 2026-10-02. Promoted by a pre-registered gate: on 2016-2022 its Brier score was 0.036 against 0.049 for the previous method, and on a single 2024 run 0.023 against 0.032 (experiments/district_gate_result.md, with an independent review).