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FORECAST21 DAYS OUT
← HouseNovember 3, 2026 · 21 days out

Brian Jack is heavily favored to hold Georgia’s 3rd congressional district. Predicted first-round margin: R+15.4.

Brian Jack incumbent (R)94 in 10093.8%57.7high 61.3 · low 54.0
Maura Keller (D)6 in 1006.2%42.3high 46.0 · low 38.7
Other (minor parties / write-ins)—0.0high 0.0 · low 0.0

high / low: vote share (%) in the middle 80 in 100 simulations · * incumbent

Likely R80% range · first-choice margin R+22.5 to R+8.1Republican-held seat

Forecast history

Moving D · strong+6.8 pts · Oct 11 → Oct 13GA-03 U.S. House: moving toward the Democrat, strong — the published margin moved +6.8 points between the Oct 11 and Oct 13 editions (3 of 32 stored editions). This is movement of the published forecast between editions.
R+15R+20Aug 1Nov 3 · Election Day

Latest reading · Oct 13 · first published Sep 9 · 80% range · margin points R+22.5 to R+8.1. Methodology

Hover the line, tap it, or use the arrow keys to read the margin on a day.

About this series

Reconstructed with the current model Aug 1 – Sep 8 and Sep 16 – Sep 18; published readings Sep 9 – Oct 13. Each reconstructed day is the current model on that day’s own inputs, not a forecast published then. Corrections are dated in the changelog.

Faded: CTMM 2.2 reconstructed history: computed after the fact with each date's available polls and environment, without expert ratings; not an issued forecast. Issued forecasts begin at the launch marker.

CTMM 2.2 readings for 2026-09-16, 2026-09-17, 2026-09-18 were computed after the fact with each day's available inputs: no edition was issued on those days. Not an issued forecast.

Data table
DateMarginChance80% rangeReading
Oct 13R+15.4R win 98.3%R+22.5 to R+8.1Published forecast
Oct 12R+22.2R win 98.9%R+29.8 to R+14.6Published forecast
Oct 11R+22.2R win 98.9%R+29.8 to R+14.6Published forecast
Oct 10R+22.1R win 98.9%R+29.7 to R+14.5Published forecast
Oct 9R+22.2R win 98.9%R+29.8 to R+14.6Published forecast
Oct 8R+22.2R win 98.9%R+29.8 to R+14.6Published forecast
Oct 7R+22.2R win 98.9%R+29.8 to R+14.6Published forecast
Oct 6R+22.3R win 98.9%R+29.9 to R+14.7Published forecast
Oct 5R+22.3R win 98.9%R+29.9 to R+14.7Published forecast
Oct 4R+22.3R win 98.9%R+29.9 to R+14.7Published forecast
Oct 3R+22.3R win 99.0%R+30.0 to R+14.7Published forecast
Oct 2R+22.3R win 99.0%R+30.0 to R+14.7Published forecast
Oct 1R+22.3R win 99.0%R+30.0 to R+14.7Published forecast
Sep 30R+22.3R win 98.9%R+30.0 to R+14.7Published forecast
Sep 29R+22.4R win 99.0%R+30.0 to R+14.7Published forecast
Sep 28R+22.4R win 99.0%R+30.0 to R+14.7Published forecast
Sep 27R+22.4R win 98.9%R+30.0 to R+14.7Published forecast
Sep 26R+22.4R win 99.0%R+30.0 to R+14.7Published forecast
Sep 25R+22.4R win 98.9%R+30.0 to R+14.7Published forecast
Sep 24R+22.4R win 99.0%R+30.1 to R+14.7Published forecast
Sep 23R+22.5R win 98.9%R+30.2 to R+14.8Published forecast
Sep 22R+22.5R win 99.0%R+30.2 to R+14.8Published forecast
Sep 21R+22.5R win 99.0%R+30.2 to R+14.8Published forecast
Sep 20R+22.5R win 98.9%R+30.2 to R+14.8Published forecast
Sep 19R+22.5R win 99.0%R+30.2 to R+14.8Published forecast
Sep 18R+22.4R win 98.9%R+30.2 to R+14.7Published forecast
Sep 17R+22.5R win 98.9%R+30.2 to R+14.7Published forecast
Sep 16R+22.5R win 98.9%R+30.2 to R+14.7Published forecast
Sep 15R+22.7R win 99.0%R+30.4 to R+14.9Published forecast
Sep 14R+22.6R win 99.0%R+30.3 to R+14.8Published forecast
Sep 13R+22.6R win 98.9%R+30.4 to R+14.9Published forecast
Sep 12R+22.6R win 99.0%R+30.4 to R+14.9Published forecast
Sep 11R+22.7R win 99.0%R+30.4 to R+14.9Published forecast
Sep 10R+22.7R win 98.9%R+30.5 to R+15.0Published forecast
Sep 9R+22.6R win 99.0%R+30.4 to R+14.8Published forecast
Sep 8R+22.8R win 99.0%R+30.6 to R+15.0Reconstructed with the stated inputs
Sep 7R+22.9R win 99.0%R+30.6 to R+15.1Reconstructed with the stated inputs
Sep 6R+22.9R win 99.0%R+30.7 to R+15.1Reconstructed with the stated inputs
Sep 5R+22.9R win 99.0%R+30.7 to R+15.1Reconstructed with the stated inputs
Sep 4R+22.9R win 99.0%R+30.7 to R+15.1Reconstructed with the stated inputs
Sep 3R+22.9R win 99.0%R+30.7 to R+15.1Reconstructed with the stated inputs
Sep 2R+22.9R win 99.0%R+30.7 to R+15.1Reconstructed with the stated inputs
Sep 1R+22.9R win 99.0%R+30.7 to R+15.1Reconstructed with the stated inputs
Aug 31R+22.9R win 99.0%R+30.7 to R+15.1Reconstructed with the stated inputs
Aug 30R+22.9R win 99.0%R+30.7 to R+15.1Reconstructed with the stated inputs
Aug 29R+22.9R win 99.0%R+30.7 to R+15.0Reconstructed with the stated inputs
Aug 28R+22.9R win 99.0%R+30.7 to R+15.1Reconstructed with the stated inputs
Aug 27R+22.9R win 99.0%R+30.7 to R+15.0Reconstructed with the stated inputs
Aug 26R+22.9R win 99.0%R+30.8 to R+15.1Reconstructed with the stated inputs
Aug 25R+22.9R win 99.0%R+30.8 to R+15.1Reconstructed with the stated inputs
Aug 24R+22.9R win 99.0%R+30.8 to R+15.1Reconstructed with the stated inputs
Aug 23R+22.9R win 99.0%R+30.8 to R+15.0Reconstructed with the stated inputs
Aug 22R+22.9R win 99.0%R+30.8 to R+15.1Reconstructed with the stated inputs
Aug 21R+23.0R win 99.0%R+30.8 to R+15.1Reconstructed with the stated inputs
Aug 20R+22.9R win 99.0%R+30.8 to R+15.1Reconstructed with the stated inputs
Aug 19R+22.9R win 99.0%R+30.8 to R+15.0Reconstructed with the stated inputs
Aug 18R+22.9R win 99.0%R+30.8 to R+15.0Reconstructed with the stated inputs
Aug 17R+22.9R win 99.0%R+30.8 to R+15.0Reconstructed with the stated inputs
Aug 16R+22.9R win 99.0%R+30.8 to R+15.0Reconstructed with the stated inputs
Aug 15R+22.9R win 99.0%R+30.8 to R+15.0Reconstructed with the stated inputs
Aug 14R+23.0R win 99.0%R+30.9 to R+15.1Reconstructed with the stated inputs
Aug 13R+23.0R win 99.0%R+30.9 to R+15.1Reconstructed with the stated inputs
Aug 12R+23.0R win 99.0%R+30.9 to R+15.0Reconstructed with the stated inputs
Aug 11R+23.0R win 99.0%R+30.9 to R+15.0Reconstructed with the stated inputs
Aug 10R+23.0R win 99.0%R+30.9 to R+15.0Reconstructed with the stated inputs
Aug 9R+23.0R win 99.0%R+30.9 to R+15.0Reconstructed with the stated inputs
Aug 8R+23.0R win 99.0%R+30.9 to R+15.0Reconstructed with the stated inputs
Aug 7R+23.0R win 99.0%R+30.9 to R+15.0Reconstructed with the stated inputs
Aug 6R+23.1R win 99.0%R+31.0 to R+15.1Reconstructed with the stated inputs
Aug 5R+23.1R win 99.0%R+31.0 to R+15.1Reconstructed with the stated inputs
Aug 4R+23.1R win 99.0%R+31.0 to R+15.1Reconstructed with the stated inputs
Aug 3R+23.1R win 99.0%R+31.1 to R+15.1Reconstructed with the stated inputs
Aug 2R+23.1R win 99.0%R+31.1 to R+15.1Reconstructed with the stated inputs
Aug 1R+23.1R win 99.0%R+31.1 to R+15.1Reconstructed with the stated inputs

The polls

Poll average R+5.0A poll’s weight halves every 60 days and grows with its sample, up to one and a half times a 600-interview poll. Each pollster counts once, at its best release. Every poll is counted at its published margin, and a poll sponsored by a party or campaign counts like any other here.The forecast then counts a poll sponsored by a party or campaign at full weight and moves its margin 2 points against that party, which puts the average it reads at R+7.0.1 recorded poll · 1 in the poll average

FieldworkAddedPollsterResultSample
from 2026-10-0212h agoVoteNexus ↗R+5.0D 45% · R 50%301 LV
Explore all 1 poll for this race

How the margin was built

Follow each contribution to the margin. Wider ribbons mean more percentage points. Tap an input for its calculation and source.

Toward D+14.5
Toward R−29.8
Forecast marginR+15.4

The signed totals combine at the forecast. Displayed values are rounded.

All calculations & sources

This district's measured terrain −29.836 points

Call the Map's partisan lean on the CURRENT district lines, before any current-cycle evidence. Every pull below is measured from here — not from EVEN.

  • Call the Map partisan lean, district geography bound to this forecast edition.
  • Prior source: observed_unchanged_lines.

This race’s polls +6.838 points

What this race’s own recent polling adds beyond its prior. The forecast weights each poll for recency and sample size and counts each pollster once; the weights listed here are those of the polls’ own average.

  • VoteNexus (2026-10-07, n=301): R+5.0 · weight 0.44 in the poll average
  • Poll average R+5.0, from 1 poll · 1 recorded poll. This is the polls’ own average, each poll at its published margin, the figure this page’s poll summary shows. The forecast then counts a poll sponsored by a party or campaign at full weight and moves its margin 2 points against that party, which puts the average it reads at R+7.0. The forecast gives the polls 45% of the weight against its structural prior for this race; the recorded polling contribution is +6.8 D. Eligible polls: latest poll: 2026-10-07 (6 days old).

Fitted model, above the terrain shown +5.874 points

What the fitted model adds on top of the starting terrain above — incumbency, past results, campaign finance and the other fitted terms — measured from that terrain rather than from EVEN. It is a comparison with the starting point already shown, not a separate input. The source detail lists the variables the fit uses.

  • Fitted baseline -23.962 minus starting point -29.836 = 5.874 points.
  • One fitted structural total; this edition does not split it into partisan lean and incumbency.
  • Fundamentals: −24.0 — the district's structural lean before this year's polling, money and candidate quality are added.
  • This edition publishes that as one fitted total. It does not break it into a partisan-lean and an incumbency term, so this page does not invent that split.
  • fundamentals core = 25-term dynamic formula (mass fit over the master feature matrix, held-out-cycle validated; see matrix/feature_dictionary.md + mass_fit_report.json)
  • 40-term formula, held-out validated.

National environment +1.806 points

The contribution to this race’s margin, not the national polling margin itself. The race’s loading, reference level and polling blend determine how much of the national climate reaches its final forecast.

  • Three-source blend, updated 2026-09-08: 51% generic-ballot aggregates (D+6.5) · 29% special-election overperformance (D+9.0 across 46 specials) · 19% approval-implied (D+8.6 from net approval -21.7).
  • Latest polls — generic ballot 2026-09-08 (35 days old), approval 2026-09-10 (33 days old).
  • Generic-ballot average D+6.5 · support factor 0.80 (the share of that channel's capacity the admitted polls carry) — separate inputs; their product is a capacity diagnostic, not a margin.
  • Weights are the 55/25/20 capacities scaled by each channel's evidence and renormalized, so thin polling widens the interval instead of pulling the center toward zero — 19% of the weight is carried that way.
  • Blended national environment: D+7.6.
  • Applied at full strength to this chamber's races.
  • This step’s recorded contribution to the margin is +1.8.
  • Blended national environment: D+7.6 (updated 2026-09-08).
  • Effective poll weight 81%; fundamentals share 19%, carried by the interval (×1.09) rather than by the center.
  • The support factor is the share of the generic-ballot capacity the admitted polls carry; average × support is a capacity diagnostic, not a margin, and is not what the row above multiplies.
  • Applied at full strength to this chamber: +1.8 of this margin.

Votes for other candidates +0.000 points

Every step above is measured between the two major-party candidates alone, as if nobody else were on the ballot. The forecast sets 0.0% of the vote aside for other candidates and write-ins, so as a share of every vote cast the gap between the two is smaller by that much. This step is exactly that: the two-party margin times the share going to other candidates. It is the same arithmetic that turns the two-party margin into the two shares printed at the top of the page.

The components this edition publishes for this race, in points. “Other factors” closes the sum to the two-party structural lean exactly. Here the structural lean IS the published margin, so the walk sums to the projection exactly; nothing is left over.

Named factorContribution
FundamentalsThe admitted fitted baseline. Its surviving variables differ by office; the source detail above identifies those used for this race.−23.96
This race's pollsAdmitted head-to-head polls of this race, recency- and quality-weighted.+6.84
National environmentThe national environment’s contribution to the prior. Polling can attenuate its influence; this value is not the national polling margin.+1.81
Other factors0.00

Where the votes are

The map of this race loads here.

Recent elections

ElectionResultVotes cast
2024 · U.S. House ↗R+32.6411,785
2022 · U.S. House ↗R+37.5310,581
2020 · U.S. House ↗R+30.1371,318
2018 · U.S. House ↗R+31.1293,006

Historical district boundaries may differ. Margins are the Democrat’s share of all votes cast minus the Republican’s. Nonstandard ballots are labeled separately.

The money

Bar length compares reported receipts in this race; the tick marks cash on hand. A missing filing stays blank rather than becoming $0.

One more fundraising reportCall the Map · $105

The candidates are comfortably out-fundraising the website covering them. A little rude, perhaps, but statistically unsurprising.

Received so far
$105
Measured compute
$26,188.58

Ko-fi and Buy Me a Coffee supports are counted as each one arrives. Measured compute prices model runs at standard published API rates; it is not what I paid. Hosting, data and subscriptions, the domain and my own time are not counted. Donations buy gratitude, never a forecast adjustment.

Supporters are listed by first name and last initial. Want your full name shown? Say so in your message. Give privately, or leave the name blank, and you are counted without a name.

Thank you to Tom H. and ColoradoFlyer.

See the public support ledger →

No outside spending matched: Brian Jack, Maura Keller.

FEC filings · through 06/30/2026 · Definitions & method

Race context

2024 presidential vote here
418,554
2024 presidential margin
R+29.9
between the two parties

Population profile Select a measure for its source and denominator

White alone · 67.7%520,021 of 767,633 · Residents2022 Census · matched race geography

Forecast as of October 13, 2026: Call the Map currently has Brian Jack ahead of Maura Keller by R+15.4 in the first round, with a 94 in 100 chance to win, runoff included. The seat is currently held by a Republican. That result would keep the seat with Republicans. The current poll average is R+5.0; 1 public poll is recorded.