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Will a new Constitutional Amendment be added before Jan 20, 2029?

KXCONSTAMEND-29-JAN20 · Politics · 2026-04-03
4%
Multi-Step
7%
Market Price
-3.0%
Edge
50%
Confidence
Final Rationale
My independent estimate of 2.5% was grounded in the strong structural barriers to constitutional amendments (two-thirds Congressional supermajority + three-fourths state ratification) and the zero-success base rate since 1971 for new proposals. However, I PARTIALLY ACCEPT the Devil's Advocate critique on several points: (1) my evidence collection was asymmetrically skewed toward downside factors (10 down, 0 up, 0 neutral), which is a genuine bias concern; (2) I acknowledged 6 information gaps (ERA court status, Article V convention traction, etc.) yet claimed 'high confidence,' which was inconsistent; (3) the ERA pathway with 38 technical ratifications creates a non-trivial legal tail risk I may have underweighted. I REJECT the suggestion that Congressional proposal probability should be meaningfully higher than 1% — even crisis scenarios rarely produce two-thirds supermajorities in today's polarized environment. I also REJECT full convergence toward the 7% market price because the market has LOW-MEDIUM reliability with thin liquidity and a volatile historical range (3-18%), making it a weak signal. My final 4% reflects a modest upward adjustment from 2.5% to account for asymmetric evidence bias, the ERA legal uncertainty I cannot fully evaluate, and non-zero Article V convention risk, while still staying below the market price because the structural barriers are genuinely formidable and well-documented.
What Would Change My Mind
A federal court ruling ordering the Archivist to certify the ERA would push this to 15-25%. Alternatively, if 34+ states formally filed valid Article V convention applications on a common topic, or if a major bipartisan crisis (e.g., government default, contested election) generated serious Congressional momentum for a specific amendment with visible whip counts approaching two-thirds, I would revise upward by 10+ points.
1. Planning Agent Sonnet
binary politics article_search web_search kalshi_data congress_bills court_docket
Sub-questions
IDQuestionWeight
sq1 Will Congress propose a constitutional amendment with a two-thirds supermajority in both chambers before Jan 20, 2029? 50%
sq2 If Congress proposes a constitutional amendment, will three-fourths of state legislatures ratify it before Jan 20, 2029? 35%
sq3 Is there currently an unratified constitutional amendment (e.g., ERA or others) close enough to ratification that it could be certified before Jan 20, 2029? 15%
Reasoning Approach
The U.S. has only added 27 constitutional amendments in 235+ years, with the last (27th) ratified in 1992 after a 203-year journey. The process requires two-thirds of both Congressional chambers plus three-fourths of state legislatures (38 states) — an extraordinarily high bar. The key reference class is: in any given 4-year period, the probability of a new amendment being added is extremely low (roughly 27 amendments over ~235 years = ~0.115 amendments/year, but clustered historically). The most plausible near-term pathways are: (1) ERA ratification — contentious due to legal challenges about the deadline, archivist refusal to certify, and recent court rulings; (2) a novel amendment gaining sudden bipartisan support (very unlikely in current polarized environment); (3) Article V convention (no precedent, very unlikely by 2029). The current political environment (divided/polarized Congress, partisan gridlock) makes congressional proposal extremely unlikely. The ERA pathway depends on court outcomes. This question differs from typical policy questions because it requires supermajority consensus across both parties and branches — a structural barrier beyond normal political analysis.
2. Research Execution No LLM
ToolStatusTime
article_search OK 0.66s
web_search OK 49.99s
kalshi_data OK 1.55s
congress_bills FAILED 0s
court_docket OK 0.36s
Errors: congress_bills: CONGRESS_API_KEY not set (sign up at api.congress.gov/sign-up)
3. Evidence Synthesis Sonnet · 10 items
#StrengthDirectionSourceClaimPriced In
1 STRONG ↓ DOWN web_search Since 1992, more than 1,400 proposed constitutional amendments have been introduced in Congress, and not one has received the two-thirds vote required in both chambers to advance to states for ratification. Yes
2 STRONG ↓ DOWN web_search Multiple constitutional amendment proposals were introduced in the 119th Congress (2025-2026), including a presidential third-term amendment (H.J.Res. 29), congressional term limits, non-citizen voting ban, and others — but all were referred to committee with no two-thirds supermajority support evident. Yes
3 STRONG ↓ DOWN web_search Congress typically proposes around 200 amendments per two-year term, but virtually none escape committee; the structural requirement of two-thirds in both chambers has not been met since the 27th Amendment process. Yes
4 MODERATE ↓ DOWN kalshi_data The Kalshi market for a new constitutional amendment being added before Jan 20, 2029 is priced at 7%, down 7% in 7 days and down 1% over 30 days, with a historical range of 3-18%. Yes
5 MODERATE ↓ DOWN article_search A September 2025 book review discusses the historical difficulty of amending the Constitution, noting that the ERA nearly succeeded with bipartisan support in the 1970s but was blocked, and the Electoral College abolition effort died in the Senate despite 80% public support — illustrating structural barriers to amendment. Yes
6 STRONG ↓ DOWN web_search No constitutional amendment has been sent by Congress to states for ratification since the 27th Amendment process; even if Congress proposed one, ratification by 38 state legislatures would need to occur within the timeframe, which historically takes years to decades. Yes
7 MODERATE ↓ DOWN article_search Political polarization between parties in Congress is severe enough that even getting a two-thirds supermajority to propose an amendment is implausible, making the subsequent 38-state ratification question largely hypothetical. Yes
8 MODERATE ↓ DOWN article_search As of March 2026, the ERA remains unratified and is the subject of advocacy (e.g., Women's History Month ERA tours), but faces ongoing legal challenges including archivist refusal to certify and court rulings about expired deadlines — indicating it is not close to being formally added to the Constitution. Yes
9 MODERATE ↓ DOWN article_search A September 2025 article notes the ERA was stalled three states short of ratification due to Phyllis Schlafly's countermovement, and while Virginia, Nevada, and Illinois ratified after the deadline, legal disputes about the deadline and rescissions remain unresolved. Yes
10 MODERATE ↓ DOWN kalshi_data The Kalshi market for the constitutional amendment question peaked at 18% and is now at 7%, suggesting market participants see very low probability of any pathway — including ERA — succeeding before Jan 20, 2029. Yes
Information Gaps
  • No specific data on the current legal status of ERA court challenges (e.g., whether any federal circuit court has ruled definitively on the deadline question in 2025-2026)
  • No data on whether any constitutional amendment proposals in the 119th Congress have advanced beyond committee referral
  • No information on any Article V convention movements gaining traction at the state level
  • No data on whether the Trump administration or Republican leadership has actively pushed any specific amendment toward floor votes
  • No information on the current archivist's position on ERA certification under the current administration
  • Missing evidence on whether the 7% Kalshi price drop in the past 7 days corresponds to any specific news event
Key Uncertainties
  • Whether any federal court ruling on the ERA deadline could force certification before Jan 20, 2029
  • Whether a sufficiently galvanizing political event (e.g., constitutional crisis, bipartisan consensus moment) could suddenly accelerate an amendment proposal
  • Whether the Trump administration's approach to the ERA and the archivist role changes the ERA pathway
  • Whether any of the currently introduced amendment proposals (e.g., non-citizen voting ban) could attract unexpected bipartisan support in the current Congress
  • The pace and outcome of any ongoing ERA-related litigation that could reach the Supreme Court before 2029
Market Context
Price: 0.07 · 7d: -0.07 · 30d: -0.01
Volume: LOW-MODERATE — 145 average daily contracts · Depth: UNKNOWN
Reliability: LOW-MEDIUM — moderate volume but thin market; 7-day drop of 7 percentage points is notable but may reflect thin liquidity rather than new information; historical range of 3-18% suggests significant uncertainty in market pricing over time
4. Independent Forecaster Opus · No market price Did NOT see market price
Independent estimate: 2% (high confidence)
sq1: Will Congress propose a constitutional amendment with a two-thirds supermajority in both chambers before Jan 20, 2029?
1%
Base rate: Since 1992 (33 years), zero amendments have been proposed by Congress despite ~1,400+ attempts. That's 0 successes in ~16 congressional terms. Even looking at the broader history, the pace of amendment proposal has slowed dramatically — the last successful proposal was in 1971 (26th Amendment, excluding the 27th which was proposed in 1789). In the current hyper-polarized environment, achieving two-thirds in both chambers is nearly impossible. The 119th Congress proposals (term limits, non-citizen voting ban, third-term amendment) all lack anything close to supermajority support. Even issues with 80%+ public support (like Electoral College reform) have failed to clear this bar. There are two more Congresses before Jan 20, 2029 (119th and 120th), but structural conditions are not meaningfully different from the last 33 years of failure. I see no plausible pathway to two-thirds in both chambers. Estimate: ~1%.
sq2: If Congress proposes a constitutional amendment, will three-fourths of state legislatures ratify it before Jan 20, 2029?
25%
This is conditional on sq1 happening. If Congress actually managed to pass an amendment with two-thirds supermajority in both chambers, that would signal extraordinary bipartisan consensus. Historically, once proposed, most amendments do get ratified eventually — 27 of 33 proposed amendments were ratified (82%). However, the timeframe constraint is tight: if proposed in 2027 or 2028, getting 38 state legislatures to act before Jan 20, 2029 would be very challenging. Some amendments were ratified quickly (26th Amendment took ~100 days), but many took years. The speed depends on the nature of the amendment and how strong the consensus is. Given the conditional nature (if it passed Congress with supermajority, it likely has broad support), but the tight timeline, I estimate ~25% conditional probability.
sq3: Is there currently an unratified constitutional amendment (e.g., ERA or others) close enough to ratification that it could be certified before Jan 20, 2029?
2%
The ERA is the only plausible candidate here. Three states ratified after the congressionally imposed deadline (Nevada 2017, Illinois 2018, Virginia 2020), bringing the total to 38. However: (1) The archivist has refused to certify it. (2) Five states attempted to rescind their ratifications. (3) Federal courts have generally sided against the ERA's validity without a new congressional deadline extension or removal. (4) The current Trump administration is hostile to ERA certification. (5) The Supreme Court would likely need to rule, and its current conservative majority is unlikely to force certification. The legal pathway would require either: a favorable Supreme Court ruling forcing certification (very unlikely with current court composition), or Congress removing the deadline (requires simple majority in both chambers plus presidential signature or veto override — unlikely with current Congress). Under the Trump administration through Jan 2029, active obstruction of ERA certification is expected. Other unratified amendments (Congressional Apportionment Amendment, Titles of Nobility Amendment) have no realistic pathway. Estimate: ~2%.
Show full reasoning trace
base rate: 27 amendments in 235+ years, but heavily clustered (first 10 in 1791, 3 post-Civil War, several in early 20th century). Since 1971, only 1 amendment proposed by Congress (26th), and the 27th was ratified in 1992 from a 1789 proposal. In any given 4-year window since 1971, the base rate is approximately 1 in 14 (the 26th) or arguably 0 in the modern polarized era. Base rate: ~2-5%.
evidence updates: Strong downward pressure from: (1) 33 years of zero successful proposals despite 1,400+ attempts (-2%); (2) Current extreme polarization making two-thirds threshold nearly impossible (-1%); (3) ERA legal challenges and hostile administration making certification pathway very narrow (-1%); (4) No amendment proposals in 119th Congress showing any traction (-0.5%). Minor upward uncertainty from: unknown future events, possible constitutional crisis (+0.5%).
combination method: Two independent pathways: (1) New proposal through Congress + state ratification (conditional: 0.01 * 0.25 = 0.25%); (2) ERA or existing amendment certification (2%). Combined: ~2.5%.
final: The probability of a new constitutional amendment before Jan 20, 2029 is approximately 2.5%. The structural barriers (two-thirds Congressional supermajority + three-fourths state ratification) are extremely high, the political environment is deeply polarized, and the ERA pathway faces serious legal and political obstacles under the current administration. No plausible near-term pathway exists that would overcome these barriers within the timeframe.
5. Devil's Advocate Sonnet Market price revealed
Asymmetric Evidence Overconfidence Missing Info Generic Reasoning Over Anchored
Challenges
  1. The forecaster estimates 2.5% while the market says 7% — a nearly 3x divergence. The forecaster's reasoning is heavily weighted toward structural/historical barriers, but the market is pricing something meaningful that the forecaster may be dismissing. With LOW-MEDIUM reliability and thin volume, the 7% price could reflect genuine uncertainty the forecaster is underweighting, not just speculative noise.
  2. The ERA pathway probability of 2% may be too low given the forecaster's own information gap: they acknowledge NOT knowing the current legal status of ERA court challenges in 2025-2026. A favorable federal circuit court ruling could force the question to the Supreme Court rapidly, and even a 5% chance of a surprise SCOTUS ruling forcing certification would materially change the calculus. The ERA has 38 state ratifications — the technical threshold — and legal uncertainty cuts both ways.
  3. The forecaster's sq1 estimate of 1% (Congress proposes an amendment) is arguably the most aggressive downward call and deserves scrutiny. The Trump administration has shown willingness to push constitutional norms aggressively, and Republican leadership could theoretically use an amendment (e.g., term limits, non-citizen voting, or even a debt ceiling amendment) as a political vehicle even without realistic ratification prospects — but the question only requires proposal AND ratification. However, the forecaster may be underweighting that in a hypothetical national emergency or crisis scenario, supermajorities have been achieved historically in short windows.
  4. The evidence is severely asymmetric: 10 DOWN evidence items, 0 UP, 0 NEUTRAL. This is a red flag for confirmation bias. The forecaster has explicitly searched for and catalogued reasons this won't happen, but has not systematically searched for tail-risk scenarios where it could. What about an Article V convention? The forecaster acknowledges this as an information gap but assigns it essentially zero weight. Several states have active convention applications pending.
  5. The 7-day market drop of 7 percentage points (from ~14% to 7%) is attributed to 'thin liquidity' but this is generic reasoning. A drop of this magnitude in a low-volume market often reflects a specific informational event — possibly a court ruling against the ERA, a specific legislative failure, or updated guidance from the administration. The forecaster lacks this information but should be widening uncertainty bounds rather than treating the drop as validation of their 2.5% estimate.
  6. The combination math deserves scrutiny: The forecaster says '2 independent pathways' and adds 0.25% + 2% ≈ 2.5%. But these aren't fully independent — if there's a constitutional crisis driving Congress to propose an amendment (sq1), that same environment might also produce ERA certification momentum. The pathways have positive correlation in extreme scenarios, which would slightly increase the combined probability, not decrease it.
  7. The forecaster claims 'high confidence' at 2.5% despite acknowledging 6 significant information gaps including: ERA court status, Article V convention traction, Trump administration amendment priorities, and the cause of the 7% market drop. High confidence is incompatible with this many acknowledged unknowns. The honest uncertainty range should be something like 1-8%, not a point estimate of 2.5% with high confidence.
Suggested adjustment: +2pp
Increase by 2.5 percentage points (to approximately 5%) primarily because: (1) severe asymmetric evidence collection biases the estimate downward; (2) the ERA pathway at 2% may be underestimated given unresolved court challenges that the forecaster explicitly acknowledges not knowing about; (3) the Article V convention pathway is assigned essentially zero weight despite known pending state applications; (4) 'high confidence' is unwarranted with 6 acknowledged information gaps; (5) the market's 7% price, even accounting for thin liquidity, likely reflects some genuine tail-risk scenarios the forecaster's framework isn't capturing. The adjusted 5% still respects the genuine structural barriers while not dismissing the market signal entirely.
Market comparison: Forecaster: 2.5%, Market: 7.0%. Divergence is -4.5 percentage points (forecaster is significantly below market). This is a meaningful divergence that the forecaster has not adequately justified with specific evidence — the rationale relies heavily on historical base rates and structural barriers (valid) but acknowledges multiple specific information gaps that should widen the uncertainty band toward the market price rather than away from it. The market's historical range of 3-18% suggests genuine uncertainty over time, and the forecaster's 2.5% sits near the bottom of that historical range without a specific, concrete catalyst for being that confident.
6. Final Forecast Opus
4% (medium confidence)
My independent estimate of 2.5% was grounded in the strong structural barriers to constitutional amendments (two-thirds Congressional supermajority + three-fourths state ratification) and the zero-success base rate since 1971 for new proposals. However, I PARTIALLY ACCEPT the Devil's Advocate critique on several points: (1) my evidence collection was asymmetrically skewed toward downside factors (10 down, 0 up, 0 neutral), which is a genuine bias concern; (2) I acknowledged 6 information gaps (ERA court status, Article V convention traction, etc.) yet claimed 'high confidence,' which was inconsistent; (3) the ERA pathway with 38 technical ratifications creates a non-trivial legal tail risk I may have underweighted. I REJECT the suggestion that Congressional proposal probability should be meaningfully higher than 1% — even crisis scenarios rarely produce two-thirds supermajorities in today's polarized environment. I also REJECT full convergence toward the 7% market price because the market has LOW-MEDIUM reliability with thin liquidity and a volatile historical range (3-18%), making it a weak signal. My final 4% reflects a modest upward adjustment from 2.5% to account for asymmetric evidence bias, the ERA legal uncertainty I cannot fully evaluate, and non-zero Article V convention risk, while still staying below the market price because the structural barriers are genuinely formidable and well-documented.
Pipeline Timing
StepTime
Planning 15.42s
Research 49.99s
Synthesis 32.76s
Forecaster 31.84s
Critic 26.67s
Final 12.83s