Upset Brief · CA-45 · Chuong V. Vo (R) vs. Derek Tran (D), incumbent
Vo gets within 2,264 votes on campaign work alone. A 1.1-point national shift finishes it.
37%
odds today
44%
odds with the plan
4,669
net votes to find
37
days left; voting starts October 5
Where
- 01+429Garden GroveStarting line Vo +2. 1.7% split their ticket.
- 02+398WestminsterStarting line Vo +9. 2.7% split their ticket.
- 03+366FullertonStarting line Tran +4. 3.3% split their ticket.
- 04+242CypressStarting line Vo +1. 2.3% split their ticket.
- 05+241Fountain ValleyStarting line Vo +8. 1.7% split their ticket.
- 06+212CerritosStarting line Tran +16. 2.1% split their ticket.
The top 12 cities and unincorporated areas carry 96% of the plan.
How
- P+2,002Persuade2,002 voters who split their ticket in recent elections and lean Tran today.
- M+5MobilizeAt least 60 people who voted in 2024 but not in 2022, in cities and unincorporated areas where Vo's side wins at least 55 percent.
- C+398ConsolidateVoters who went third party in recent races, in the cities and unincorporated areas that lean Vo's way.
Plus a national shift of 1.1 points of margin (2,264 votes) that no campaign controls.
What has to be true
- Vo wins 50 percent of the ticket splitters now leaning Tran.
- The national environment moves about 1.1 points toward Vo's side between now and November 3.
- No 2026 public poll exists for this race, so the starting line is a weighted blend of official recent results; the first real poll will move it.
The numbers behind it
- 01Crossover regression401 precincts, R² 0.893, 79 crossover precincts identified
- 02Monte Carlo20,000 seeded simulated elections with a 7-point baseline error. 90% range of the final margin with the plan: -25,592 to 21,102 votes.
- 03Money, FEC candidate totals through June 30Vo $74,876 cash on hand; Tran $3,257,398.
- 04Call program for this list3,589 households, 10,767 dials, about 564 live conversations: an estimated $2,048 at published rates.
Independent analysis by The Political Group from official California Secretary of State precinct returns (2022 and 2024), FEC filings and published polls, as of September 26, 2026. Not affiliated with any candidate or party.