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Toss-up · 2018 House
California House
In the 2018 California House race, Jim Costa (D) won by about 15 points.
Actual result
D+15.1
Final polls said
D+11.0
1 late poll · ✓
VotePredictor Elections predicted
—
Winner
Dem
"Final polls said" averages polls from the last ~3 weeks — the call right before the vote, and how pollsters are rated. VotePredictor Elections' prediction is walk-forward (trained only on earlier races).
Final rankings
How everyone who called this race did, ranked — VotePredictor Elections shown inline (★).
Pollsters — each pollster's final poll vs the result
| # | Pollster | Final call | Miss | Called |
|---|---|---|---|---|
| 1 | SurveyUSA | D+11.0 | 4.1 | ✓ |
Forecasters — pre-election win probability, scored by Brier
| # | Forecaster | Win prob | Brier | Called |
|---|---|---|---|---|
| 1 | FiveThirtyEight | Dem 98% | 0.000 | ✓ |
| 2 | VotePredictor Elections | Dem 98% | 0.000 | ✓ |
| 3 | The Economist | Dem 97% | 0.001 | ✓ |
| 4 | DDHQ/Decision Desk | Dem 95% | 0.002 | ✓ |
| 5 | Cook Political | Dem 90% | 0.010 | ✓ |
| 6 | Sabato's Crystal Ball | Dem 90% | 0.010 | ✓ |
The polls behind it
1 poll · newest firstPollsterDateSampleMiss
SurveyUSA2018-09-164
Frequently asked questions
Who won the 2018 California House race?
Jim Costa (D) won, by about 15.1 points (D+15.1).
When was the 2018 California House election held?
It was held in November 2018.
Which party matches you?
These candidates split on taxes, health care, guns, and abortion. See where you land — and which members of Congress actually vote like you.