Horizon · our Election Day forecast: polls, plus fundamentals like incumbency, fundraising and past results.

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Pennsylvania › U.S. House of Representatives · November 3, 2026 · Updated Oct 16, 2026

Pennsylvania's 8th District

Flip risk: Republican-held seat, a toss-up (53% chance it changes parties).

A toss-up: each side wins about half the simulations.

Cognetti (D)
53%
chance of winning
Bresnahan (R)
47%
Average margin
D+0.5
80% of outcomes
R+8 to D+9
Partisan lean
R+7
Polls
3in our database

Flip risk: Republican-held seat, a toss-up (46% chance it changes parties).

A toss-up: each side wins about half the simulations.

Cognetti (D)
46%
chance of winning
Bresnahan (R)
54%
Average margin
R+0.6
80% of outcomes
R+10 to D+9
Partisan lean
R+7
Polls
3in our database

Range of outcomes

Final margin across our simulations; the white dashes mark the middle 80%.

D+0.5R+20R+10EvenD+10D+20
R+0.6R+20R+10EvenD+10D+20

How the odds have moved

Chance of winning by forecast date.

0%25%50%75%100%AugSepOctNovNov 3Cognetti 53%Bresnahan 47%

Updated nightly. Each day is the current model run on the polls that had ended by then (how).

0%25%50%75%100%AugSepOctNovNov 3Cognetti 46%Bresnahan 54%

Updated nightly. Each day is the current model run on the polls that had ended by then (how).

The candidates

RepublicanIncumbent

Rob Bresnahan

Incumbent U.S. representative

Experience
Statewide office or Congress
Raised
$6.2M
From individuals
$2.3M
Spent
$5.3M
Cash on hand
$909.1K

Money: FEC, through Sep 30, 2026.

Profile and career · Wikipedia

What goes into the forecast

Every ingredient's estimate of the final margin.

National environment
D+9.5Election Day forecast; federal races run in it
Swing reaching this office
78%Of a shift in the environment, from past House races since 2016
Mid-Atlantic adjustment
+0.5How House races in the region have run against lean and environment lately
← RepublicanDemocratic →Lean + environmentUsual vote, shifted by 78% of the environment andthe Mid-Atlantic adjustmentD+1.1Fundamentals modelAdds incumbency, past results, money andexperienceD+2.4Polls in similar placesPolling of similar races in Pennsylvania andlook-alike placesD+3.7Polling average3 polls, latest Jun 23R+3.2Horizon forecastPolls + fundamentals, projected to Election DayD+0.4Pulse forecastPolls (and polling of similar places) only, todayR+0.6

Each estimate is a margin before national and statewide uncertainty is simulated. Horizon blends polls, fundamentals and a little of the similar-places estimate, weighting each by how precise it is; Pulse uses polls and similar places only.

Fundamentals inputs
Incumbency (+1 D, −1 R)-1
Fundraising edge (log ratio of individual money)0.77
Elected-experience edge-0.67
First-term incumbent-1
Seat's last result vs. expectation7.84
Incumbent's last result vs. expectation7.84

Polls

R+5EvenD+5Avg. R+3.2Aug 28Nov 3
All 3 polls
PollsterDatesSampleCognettiBresnahanMarginAdjusted
Lake Research Partners for House Majority PAC, which is focused on electing Democrats to the U.SD-sponsoredJun 18–Jun 23400 V4745D+2R+3.2
Impact Research for Cognetti's campaignD-sponsoredJun 8–Jun 11500 LV4645D+1R+3.2
Public Policy Polling for House Majority PAC, which is focused on electing Democrats to the U.SD-sponsoredAug 27–Aug 28615 V4543D+2D+1.8

Adjusted: after correcting for the pollster's house effect, registered vs. likely voters, and movement in the national environment since the poll; shown for the polls carrying the most weight in today's average. Larger dots in the chart carry the most weight. Last poll: Jun 23, 2026.

The district

Lean R+7: how much more Democratic or Republican than the nation it votes for president.

Presidential vote

← RepublicanDemocratic →2016 presidentR+7.3R+9.5 vs. nation2020 presidentR+2.0R+6.5 vs. nation2024 presidentR+8.5R+7.0 vs. nation

Precinct results re-aggregated to the current district lines.

Who lives here

Population
768,565
People per km²
104
Adults with a B.A.+
27%
White, no degree
55%of adults
  • White 73%
  • Hispanic 15%
  • Black 6%
  • Asian 2%
  • Other / multiracial 4%

American Community Survey 2020–2024, aggregated from census tracts.

Past results

Results in the same-numbered district; earlier elections may have used different lines.

2024

385,074 votes · R+1.6
✓ Rob Bresnahan, Jr. (R)50.8%
Matt Cartwright (D)49.2%

2024 President Vote in this district

385,240 two-party votes · R+8.5 · R+7.0 vs. the nation
✓ Donald Trump (R)54.3%
Kamala Harris (D)45.7%

2022

286,886 votes · D+2.4
✓ Matt Cartwright (D)51.2%
Jim Bognet (R)48.8%

2020 Earlier district lines

343,787 votes · D+3.6
✓ Matthew Alton Cartwright (D)51.8%
James Rocco Bognet (R)48.2%

2020 President Vote in this district

469,661 two-party votes · R+2.0 · R+6.5 vs. the nation
✓ Donald Trump (R)51.0%
Joe Biden (D)49.0%

2018 Earlier district lines

248,166 votes · D+9.3
✓ Matthew Alton Cartwright (D)54.6%
John Robert Chrin (R)45.4%

2016 Earlier district lines

380,818 votes · R+8.9
✓ Brian Fitzpatrick (R)54.4%
Steve Santarsiero (D)45.6%

2016 President Vote in this district

386,444 two-party votes · R+7.3 · R+9.5 vs. the nation
✓ Donald Trump (R)53.7%
Hillary Clinton (D)46.3%