Will the Supreme Court overturn gay marriage?

**Stage 1 — Blind analysis (ignore market prices):**

- *Baseline legal facts.* Obergefell v. Hodges (2015) rests on substantive due process and equal protection reasoning. Justice Clarence Thomas’s 2022 Dobbs concurrence explicitly urged reconsideration of substantive-due-process precedents, listing cases that include Obergefell. However, the Dobbs majority opinion did not adopt Thomas’s full approach, and since 2022 there has been no successful majority opinion that expressly overturns Obergefell.

- *Institutional and political constraints.* Overturning a major social-rights precedent provokes intense political backlash and places the Court under institutional pressure. Public opinion remains strongly favorable toward same-sex marriage, raising the reputational stakes for the Court and increasing the likelihood that conservative justices will prefer narrower rulings when possible.

- *Paths to overturning Obergefell.* The Court can reverse Obergefell only if: 1) a case raising an appropriate legal question reaches the Court, and 2) five justices agree to rewrite the law. That can happen either via a direct challenge framed to get the Court to address Obergefell explicitly, or via a case that erodes the doctrinal pillars (substantive due process or equal protection) in a way that collapses Obergefell.

- *Probability reasoning.* Given the above, full reversal is plausible but not the most likely outcome in the ~3-year window to 2029. The conservative majority increases the possibility relative to pre-Dobbs years, but institutional caution, public opinion, and the absence (as of today) of a direct certiorari posture arguing to overturn Obergefell lower the near-term probability. I weigh both direct reversal routes and indirect erosion paths (narrowings, carve-outs that substantially weaken the practical reach of Obergefell).

- *Quantitative estimate (Stage 1).* Combining - a nontrivial but limited chance that a suitable case will be granted cert and attract five votes to overturn (roughly 8–10%), - plus a smaller additional chance that the Court will substantially erode Obergefell via narrow doctrinal rulings or carve-outs that functionally undercut it (roughly 4–6%), I arrive at an independent probability of ~15% that by 2029 the Supreme Court will have effectively or explicitly overturned the marriage-equality holding.

**Stage 2 — Market calibration (now look at market prices):**

- *Current market:* Yes 7.1%, No 92.9% (substantial volume ~90k contracts). The market price implies a low single-digit probability of full reversal.

- *Why the market might be lower than my independent estimate:* - Market participants reasonably discount the absence of any active certiorari posture or majority signaling specifically aimed at Obergefell. The news snippet you provided is secondary-social-media referencing of Thomas’s Dobbs concurrence rather than a primary legal development; markets tend to anchor on current cert-stage signals. - The market is likely pricing in strong institutional friction: public opinion, political backlash, and the Court’s recent tendency to prefer narrower rulings where possible. Those are real and reduce near-term reversal probability.

- *Why my independent estimate is higher than the market:* - I give more weight to structural changes in the Court since Dobbs: a conservative bench that has shown willingness to overturn long-standing precedent when the right case arrives, and Thomas’s continued public advocacy for revisiting substantive-due-process precedents. I also factor in the possibility of volatile certification dynamics — a strategically framed case could reach the Court within the window, and smaller doctrinal moves can cascade into full reversal. - Market prices can be anchored by recency bias (no current case) and by reluctance to price low-probability high-impact shifts; with ~15% I view the market as underpricing the non-negligible chance of active litigation + five-justice coalition forming.

- *Trading implication (if you are a trader):* If you accept my independent model and risk parameters, buying Yes at ~7% expected value appears attractive because the expected edge (~8 percentage points) is large versus typical prediction-market inefficiencies. However, account for liquidity, timeline (time decay of news relevance), and the possibility that the market will reprice rapidly on any cert grant or new Supreme Court signals.

- *Confidence & caveats:* The estimate acknowledges wide uncertainty. A single cert grant or public signal could move probabilities sharply. My 15% is an out-of-market, evidence-weighted estimate, not a forecast of the next tweet or cert grant.