base rate:
59/59 U.S. presidential elections have occurred on schedule (100% rate). This is the strongest anchor. The base rate alone suggests >98% probability.
evidence updates:
Trump's third-term rhetoric and wartime comments push down by ~1-2%. Democratic warnings push down by <0.5%. Absence of concrete legislative/legal/executive action toward cancellation pushes back up by ~0.5%. The 2.5-year horizon creates genuine tail risk from unknown catastrophes, pushing down ~1%. The decentralized nature of U.S. election administration (50 states) provides structural resilience that pushes up ~0.5%. Net adjustment from base rate: approximately -2 to -3%.
combination method:
Weighted average of sub-questions, with sq4 inverted (since YES on sq4 = bad for main question). The sub-questions are highly correlated — if constitutional order holds (sq1), catastrophes don't cancel (sq2), and no credible cancellation activity exists (sq4), the election occurs. The binding constraint is sq1/sq2, which are both very high probability.
final:
The 2028 U.S. presidential election has an approximately 97% probability of occurring. The 3% residual risk accounts for: (1) ~1.5% chance of unprecedented authoritarian action succeeding in cancelling the election despite constitutional barriers; (2) ~1% chance of catastrophic event so severe it prevents any election from occurring (not just disrupting it); (3) ~0.5% for truly unforeseeable scenarios. This is consistent with the 59/59 historical base rate adjusted modestly downward for current political uncertainty.
ensemble:
{'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.97, 'confidence': 0.95}, 'evidence_driven': {'p_yes': 0.97, 'confidence': 0.92}, 'contrarian': {'p_yes': 0.97, 'confidence': 0.95}}, 'spread': 0.0, 'individual_p_yes': {'base_rate': 0.97, 'evidence_driven': 0.97, 'contrarian': 0.97}}