Races · house · 2020 · Arizona

house · open seat

Tom O'Halleran vs Dave Giles

← Arizona house California house →

Safe DD +18.3 forecast· 0 polls · 0 markets

Model's final pre-election call · win probabilitypoliagg-v34 · final pre-election call
99% O'Halleran (D)
1% Giles (R)
Win probability
Tom O'Halleran99% (D)
Dave Giles1% (R)
Modelpoliagg-v34 · final pre-election call
Chance of winning across many simulations of the race — not projected vote share.
R+15R+5TIEDD+5D+15
Predicted margin
Point estimateD +18.3
80% CID+6.3 → D+30.3
The model’s central margin (D-positive) with its 80% interval — the shaded band on the scale.
Model's predicted final margin D +18.3 · 80% CI D+6.3 → D+30.3
Actual result D+23.2 · backtest (race already called)

Momentum

—

insufficient data

Tipping-point P

0.0%

Decisive for chamber control

Market · D-side

—

Cross-platform consensus

News articles · 30d

—

no recent coverage

Where this race stands

Verified

Safe R · model 99% D

No recent polls or markets for this race. PVI baseline (R+15) suggests Safe R.

The poliagg-v34 ensemble forecasts D+18.3 with an 80% CI ranging from D+6.3 (10th pctile) to D+30.3 (90th pctile), giving D a 99% chance of winning.

CITATIONS · safe-r

Forecast · poliagg-v34

Predicted final margin

D +18.3

80% CI: D +6.3 → D +30.3 · win prob 99%

R+45R+23TIEDD+23D+45

Quality · inputs

Data quality · medium

Polls used	0
Days to election	passed
Actual result	D+23.2
Residual σ	6.00pt
Generated	7/1/2026

Endorsements · 0 total

Source · Wikipedia · 2 candidates with no endorsements yet

RDave Giles0 endorsers

no endorsers yet

No endorsements found yet. Endorsements come from the candidate's Wikipedia article (when one exists) and update with the daily scrape.

DTom O'Halleran0 endorsers

no endorsers yet

No endorsements found yet. Endorsements come from the candidate's Wikipedia article (when one exists) and update with the daily scrape.

Money raised · own committees

FEC Schedule E (independent expenditures) + candidate-committee totals · last filing 2020-10-31

Outside spending · independent expenditures

FEC Schedule E (independent expenditures) + candidate-committee totals · 24/48-hr IE reports

IE total

$64.1K

D side

$1.8K · 3%

R side

$62.3K · 97%

Top spender

GUN OWNERS OF AMERI…

For / against split

Against Gosar $1.8K

For Gosar $62.3K

Spender	Side	Amount	Share	Target
GUN OWNERS OF AMERICA, INC.	R	$42.3K	66%	for Paul Gosar
NATIONAL RIFLE ASSOCIATION OF AMERICA POLITICAL VICTORY FUND	R	$19.5K	30%	for Paul Gosar
BEND THE ARC JEWISH ACTION INC	D	$790.04	1%	against Paul Gosar
TOGETHER WE THRIVE	D	$750	1%	against Paul Gosar
HOUSE FREEDOM FUND	R	$426.8	1%	for Paul Gosar

Editorial ratings · 6 raters

Cook · Sabato · Inside Elections · 538 · DDHQ et al.

Safe D6

The Cook Political Report

Safe D

Nov 1

Decision Desk HQ

Safe D

Nov 2

Elections Daily

Safe D

Oct 31

538

Safe D

Nov 2

Inside Elections

Safe D

Oct 27

Sabato's Crystal Ball

Safe D

Nov 1

Demographic crosstabs

age · education · race · gender

No demographic crosstabs published for this race yet. Most pollsters release only topline numbers; subgroup breakdowns (age, education, race, gender) appear here when a pollster publishes them.

Rating timeline

Jul 1, 2026Safe Dmodel

May 15, 2026Likely Dmodel

May 11, 2026Safe Dmodel

Verification trail

Polls verified0 / 0deterministic

Polls flagged—none

Markets ingested0 platformsnone listed

FEC filingssyncedcommittee + IE · 2020-10-31

Endorsements—nothing to sync

News coverage< 5 articlesGoogle News

Method · bounds + percentage totals + date-order checks