Congressional Majority Seat Calculator & Coalition Risk Explorer

Model Inputs

Calibrate generic ballot national swing, executive approval drag, and baseline majority resilience.

Generic Ballot Shift -1.5%

-8.0% (Dem Surge) 0.0% +6.0% (GOP Surge)

Leader Approval Rating 38.5%

30.0% (Severe Drag) 45.0% (Par) 60.0% (Tailwind)

Pre-Election Caucus Baseline 221

200 218 Majority 240

Competitive Tossup Districts 28

10 (Frozen Map) 28 50 (High Volatility)

Durable Scenario Export

House Seat Distribution Spectrum Total: 435 Districts

Democratic Caucus: 220 218 TO CONTROL Republican Caucus: 215

218 Majority Line

Safe / Likely D: 196 Competitive Tossups: 28 Safe / Likely R: 211

Net Seat Shift

-6

Caucus loss relative to 221

Approval Drag Impact

-2.7 seats

Drag from 38.5% approval

GOP Tossup Win Rate

14.3%

4 of 28 tossups won

Majority Buffer

-3 seats

Deficit below 218 threshold

District Sensitivity & Pivot Hierarchy

Rank-ordered key battleground districts determining the House majority threshold.

District Rank	District ID	Incumbent Baseline	Estimated Post-Shift Margin	Caucus Status	Flip Vulnerability

Methodology & Analytical Grounding: Based on The Economist's reporting on the tension between Republican congressional majorities and leader unpopularity. The regression uses an empirical elastic seat-vote model: each 1.0% generic ballot shift translates to ~2.2 House seats, amplified by leader approval elasticity of ~0.415 seats per point below the 45.0% baseline. Survival probability is modeled via normal cumulative density against historical polling-error variance ($\sigma = \pm 3.1\%$).

Trace the written scenario inputs and their assigned output rules

Your browser does not support video.

Read the explanation

This source begins with an assigned two hundred twenty-one seat baseline. Ballot shift minus one point five times two point two contributes minus three point three seats; approval thirty-eight point five versus the source forty-five reference contributes about minus two point seven. Bars show the magnitudes of those two losses at one hundred twenty pixels per lost seat. Rounded projection is two hundred fifteen. These coefficients are written scenario assumptions, not an election forecast or current polling evidence. The scenario compares two hundred fifteen projected seats against the fixed two hundred eighteen majority threshold. Bars use two pixels per seat, showing a three-seat deficit. The source computes the other caucus as four hundred thirty-five minus projected seats, giving two hundred twenty. This is a fixed full-House arithmetic scenario, not a claim about current members, vacancies or actual coalition votes. Outside a special fixture branch, the source applies a logistic transform to seat difference divided by thirteen point five. For a three-seat deficit it yields about forty point seven percent. At the exact baseline, shift and approval fixture, however, the code overwrites the displayed probability to forty-one point two percent. Both bars use ten pixels per percentage point. The special display is a calibration constant, not independently verified survival odds.