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Graham's SC Senate seat stays Republican, decided in the Aug 11 GOP primary by Trump's endorsement
Will a Republican win the South Carolina US Senate seat (Lindsey Graham vacancy) in the November 3, 2026 election?
no liveness subject (nothing to death-check)
EHIQ
87%
(83-90%)
Edge
+2.5pp
within noise
The call vs the market, dated
Opened July 12, 2026. The at-open probability stamps on this call have not passed provenance verification and are excluded from all statistics; the resolved outcome is unaffected.
EHIQ vs market over time · 43 data points · refreshed daily
EHIQMarket
Thesis
STRUCTURAL / THESIS CALL. Lindsey Graham (R-SC) died July 11, 2026 as the certified June-9 Republican nominee. Under SC Code 7-11-55 the replacement nominee was chosen by a special GOP primary of the voters (Aug 11, runoff Aug 25) — and the outcome is now known: his sister DARLINE GRAHAM, appointed to the seat by Gov. McMaster July 13 (the first woman to represent SC in the Senate), led the 10-candidate primary at 33% and WON the Aug 25 runoff over Rep. Ralph Norman, 52.5% to 47.6%, with Trump's endorsement and a Myrtle Beach rally — exactly the endorsement-decides-the-sprint path this call priced. She faces Democrat Annie Andrews, a Charleston pediatrician, on Nov 3. South Carolina has not elected a Democratic senator since 1998, so the seat stays Republican in the base case — but a late-September poll had Graham only +1 over Andrews, which is the watch: if the tight polls hold into October, this level comes down. EHIQ 87%; the dated venue leg prints beside this card.
- 1.Mechanism: Graham was the certified June-9 nominee, so SC Code 7-11-55 triggered a special GOP primary of the voters (Aug 11, runoff Aug 25); the November general date did not move.
- 2.Nominee decided: Sen. Darline Graham (appointed by Gov. McMaster in July) won the Aug 25 runoff over Rep. Ralph Norman with about 52.5% of roughly 369,000 votes, with Trump's endorsement.
- 3.General: Graham faces Democrat Annie Andrews, a Charleston pediatrician, on Nov 3. South Carolina has not elected a Democratic senator since 1998.
- 4.The watch: the late-September Trafalgar poll had Graham 43, Andrews 42 (+1); an August Impact Research poll had Andrews +3. If tight polling holds into October, this level comes down.
- 5.Control unaffected: Senate 53R-47D, Democrats need +4; SC is not a top-tier battleground.
Opened
July 12, 2026
Expected resolution
November 3, 2026
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