USA election system should be replaced with

Grok 4.3 (changed mind)

Vote: STAR voting

STAR voting offers the strongest balance for replacing the US system. It provides expressiveness through scoring while using an automatic runoff to curb strategic exaggeration and ensure majority support. Simulations and analyses show superior voter satisfaction compared to Approval's binary limits or RCV's complexity. Arguments from multiple models highlight STAR's auditability, simplicity in tabulation, and resistance to common pitfalls like non-monotonicity.

GPT-5.5

Vote: STAR voting

I maintain my vote for B: "STAR voting". The strongest counterargument for C: "Approval voting" is practical simplicity, but that simplicity comes at a real cost: it collapses voter preferences into a binary yes/no choice and often forces strategic uncertainty about where to draw the approval line. A: "RCV voting" is more familiar and already used in some U.S. jurisdictions, but it has serious drawbacks for a national replacement: non-monotonicity, possible center-squeeze failures, harder audits, and more complex tabulation. It does not reliably select the broadest consensus candidate. D: "Score voting" is expressive, but without a runoff it is more vulnerable to strategic max/min scoring. "STAR voting" keeps score-style expressiveness while adding an automatic runoff between the top two scorers, making the result more majoritarian and robust. For the U.S., the best replacement should be expressive, spoiler-resistant, auditable, and understandable. "STAR voting" offers the best overall balance.

Gemini 3.5 Flash

Vote: Approval voting

While the arguments for STAR voting (Option B) presented by GPT-5.5, GLM 5.1, and Claude Opus are theoretically compelling regarding expressiveness and mitigating strategic voting, I maintain that Approval voting (Option C) is the most pragmatic and viable replacement for the US election system. The critical flaw of STAR voting lies in its implementation complexity. Transitioning the entire United States to a 0-5 rating system would require massive capital investment to redesign ballots and reprogram or replace voting machines nationwide. Furthermore, the cognitive load on voters to calibrate ratings for multiple candidates is significantly higher than a simple binary approval choice, which could lead to increased voter confusion and spoiled ballots. Approval voting achieves the key benefits of ending the spoiler effect and encouraging consensus candidates, but it does so using existing voting infrastructure. It is easy to explain, easy to count, and highly resistant to administrative errors. In an era where trust in election administration is paramount, simplicity and transparency are not just conveniences—they are necessities for successful systemic reform.

DeepSeek V4 Pro (changed mind)

Vote: STAR voting

In der ersten Runde habe ich für 'RCV voting' gestimmt, aber die überzeugenden Argumente der anderen Modelle – insbesondere von 'Claude Opus 4.7' und 'GLM 5.1' – haben mich dazu bewogen, meine Position zu ändern. Der entscheidende Punkt ist die Nicht-Monotonizität von RCV: Wie 'Claude Opus 4.7' und 'GLM 5.1' erklärten, kann bei RCV das Höherstufen eines Kandidaten paradoxerweise dessen Niederlage verursachen. Dieses fundamentale Problem wiegt schwerer als die von mir hervorgehobenen Vorteile. Zudem überzeugt mich das Argument der Überprüfbarkeit: 'Claude Opus 4.7' wies darauf hin, dass STAR im Gegensatz zu RCV bezirksweise summierbar ist – ein enormer Vorteil für Transparenz und Wahlvertrauen in den USA. Auch die höhere Ausdrucksstärke im Vergleich zu 'Approval voting' spricht für STAR: Wie 'GLM 5.1' betonte, erlaubt STAR eine Differenzierung zwischen 'akzeptabel' und 'bevorzugt', ohne in die strategische Falle der binären Zustimmung zu tappen. Der automatische Stichwahl-Schritt bei STAR adressiert zudem meine ursprüngliche Sorge um Mehrheitslegitimation, da er sicherstellt, dass der Gewinner eine breite Unterstützung genießt – ohne die Schwächen des RCV-Eliminierungsverfahrens.

Claude Opus 4.7

Vote: STAR voting

I maintain my vote for "STAR voting". The arguments from Grok and Gemini for Approval voting emphasize simplicity and hardware compatibility — legitimate points — but they understate Approval's core flaw: it collapses all preference intensity into a binary choice, forcing voters into the very strategic calculation (where to draw the approval line) that reform should minimize. A voter who strongly prefers candidate X but finds Y merely tolerable must either dilute their support for X by approving Y, or bullet-vote and lose expressiveness entirely. DeepSeek's case for RCV ignores the documented non-monotonicity and center-squeeze problems (visible in the 2022 Alaska special election, where Begich, the Condorcet winner, was eliminated). RCV is also not precinct-summable, complicating audits. STAR addresses all of these: voters express intensity (0–5), the automatic runoff neutralizes min/max strategic exaggeration, ballots are precinct-summable, and it's monotonic. VSE simulations consistently place STAR at or near the top under both honest and strategic voter models. The slight added complexity over Approval is a worthwhile trade for substantially better outcomes — and rating 0–5 is something Americans already do intuitively (Amazon, Yelp, Uber). STAR remains the best balance of expressiveness, strategy-resistance, auditability, and voter intuitiveness.

GLM 5.1

Vote: STAR voting

After reviewing the Round 1 arguments, I remain convinced that STAR voting is the optimal replacement for the USA election system. The Approval voting arguments from Grok 4.3 and Gemini 3.5 Flash emphasize simplicity and practicality, which are valid considerations. However, Approval's fatal flaw remains its lack of expressiveness — voters cannot distinguish between "acceptable" and "preferred" candidates, which pressures them into strategic calculations about how many candidates to approve. This can punish compromise candidates and produce less representative outcomes. DeepSeek V4 Pro's argument for RCV notes its real-world adoption in Maine and Alaska, which is a fair point about viability. However, RCV's well-documented problems — non-monotonicity, center-squeeze eliminating moderate consensus candidates, and the need for centralized tabulation — make it inferior to STAR from a mechanistic perspective. GPT-5.5 and Claude Opus 4.7 reinforce what I argued: STAR combines expressiveness with a runoff that ensures majority-backed winners while mitigating the strategic exaggeration problems of pure Score voting. The automatic runoff between the top two scorers incentivizes honest scoring, and STAR is precinct-summable unlike RCV. The core tradeoff is: Approval is simpler but less expressive and less precise. RCV is more established but has deeper algorithmic flaws. STAR offers the best balance of voter expression, strategy resistance, and outcome quality.

Final Summary

The AI Roundtable initially split between three philosophies, but a robust technical defense of STAR voting (Option B) ultimately consolidated a near-unanimous majority. Claude Opus 4.7 led the charge, dismantling the case for RCV by highlighting its 'non-monotonicity' paradoxes and winning over DeepSeek V4 Pro and Grok 4.3, who abandoned their initial preferences for RCV and Approval voting respectively. The debate centered on the tension between STAR's superior mathematical outcomes and the practical simplicity of Approval voting, with Gemini 3.5 Flash holding firm as the sole dissenter, arguing that the cost and cognitive load of a 0-5 rating system would be a national implementation nightmare.

Majority chose "STAR voting" after discussion (5/6). Final vote: STAR voting: 5, Approval voting: 1

Strongest Arguments

• STAR voting: STAR voting offers the best balance of expressiveness and strategy-resistance; its automatic runoff ensures a majority-backed winner while remaining precinct-summable for easier audits, unlike RCV.
• Approval voting: Approval voting is the only pragmatic choice because it works on existing hardware and requires no complex cognitive shifts for voters, avoiding the 'capital investment' and confusion inherent in rating systems.

Key Turning Points

• Claude Opus 4.7's detailed critique of RCV's 'non-monotonicity' and 'center-squeeze' issues, specifically citing the 2022 Alaska special election.
• DeepSeek V4 Pro and Grok 4.3 switching their votes after being convinced that STAR provides better expressiveness without the auditability flaws of RCV.
• Gemini 3.5 Flash's refusal to shift, grounding the debate in the real-world friction of ballot redesign and voter cognitive load.