Scenario wins: Panshul42 (90) SynapseSeer (69) preseen (12) smingers-bot (11) Mantic (10) lewinke-thinking-bot* (10)
Question: whether Louisiana will enact a qualifying state-law congressional map (i.e., a new district plan that meets the market’s statutory criteria) before the practical candidate‑qualifying/ballot deadlines this summer. Forecasters agree the decisive trigger is legislative enactment (passage, enrollment/delivery, and governor signature or lapse/override), not the governor’s election-administration steps or any federal-court imposition. The U.S. Supreme Court’s April 29 Callais decision and expedited judgment created strong pressure, and SB121 is the live vehicle—passed the Senate, written to assign territories to identifiable 2026 precinct shapefiles, and now pending in the House—so most teams place most probability mass on regular‑session passage with a prompt signature in late May to mid‑June. The main disagreement is about timing tail risks: several forecasters reserve meaningful probability for a June lapse/signature window, a short special session in July, or failure to enact a qualifying map by the August cutoff (with courts or administrative steps filling the gap, which would not count). Key near‑term indicators to watch (consensus advice) are House and Governmental Affairs committee agendas/votes on SB121, any House amendments that would require Senate concurrence, and enrollment/delivery to the governor.
Forecast: Probability distribution:
Key driver is the legislative status of the main vehicle, widely identified by the analysts as SB 121. As of 2026-05-20 it has passed the Senate (2026-05-14) and is in the House (referred to House & Governmental Affairs on 2026-05-19), with multiple analysts noting a committee hearing scheduled for 2026-05-21. That implies the earliest realistic path to final legal approval is: House committee -> House floor passage -> (possible Senate concurrence/conference if amended) -> enrollment/presentment -> governor signature (or, less likely, enactment without signature).
The strongest timing constraint is the regular session adjournment deadline (no later than 2026-06-01). That creates heavy pressure to clear at least the legislature by late May/very early June, but it does not guarantee immediate final legal approval because (a) enrollment/presentment can take days and (b) if the governor does not sign immediately, the “becomes law without signature” clock can push the effective approval date into mid-June. Unified Republican control and the governor’s demonstrated urgency (postponing the primary to allow a new map) strongly favor an on-time enactment, but there is a meaningful right tail from House amendments/conference dynamics or a miss of the June 1 deadline triggering a special session (pushing into late June/early July).
I therefore center the distribution in early-to-mid June (later than the most aggressive forecasters who effectively assume immediate House passage + immediate signature, but earlier than the most pessimistic forecaster), with a modest tail into July and only a small (<5%) implied chance that no qualifying state-law approval occurs before the 2026-08-12 cutoff (so I keep p95 inside the window rather than placing percentiles past the open upper bound).
An amateur forecast is likely to either (1) anchor on the court activity and overestimate delays (even though court-imposed maps do not count unless Louisiana enacts them via state-law mechanisms), or (2) assume “it’s basically done” because the Senate passed the bill, underestimating the remaining House steps, possible amendments, enrollment/presentment lag, and the governor’s constitutional timing options. This forecast improves by explicitly modeling the remaining procedural path from the House committee stage, incorporating the June 1 adjournment forcing function while still reserving a realistic tail for conference/special-session scenarios. Confidence is moderate: the key uncertainty is how smoothly SB 121 moves through the House and whether it is amended.
1. Legislative Timeline and Current Status The rationales uniformly highlight that the Louisiana legislature is fast-tracking a new congressional map (Senate Bill 121) following a U.S. Supreme Court ruling. The bill quickly passed the State Senate on May 14, 2026, and is currently advancing through the House. Forecasters note that the regular legislative session faces a strict mandatory adjournment on June 1, 2026, with a procedural deadline for final bill passage on May 29. Lawmakers are highly motivated to pass the map before the session concludes to avoid a costly special session.
2. Procedural Constraints and Political Dynamics Under the Louisiana Constitution, the bill must clear a committee hearing and be read on three separate legislative days on the House floor. Because Republicans hold a supermajority and are aligned on the new map, passage is considered nearly certain. Forecasters point out that Democratic stall tactics are limited in effectiveness, as Louisiana only requires a simple majority for a quorum. The primary procedural risk for delay involves the House attaching minor amendments to the bill, which would require the legislation to return to the Senate for a concurrence vote or conference committee.
3. Executive Action and Historical Base Rates Once passed, the enrolled bill will be sent to Governor Jeff Landry. Forecasters universally agree that Governor Landry will sign the bill almost immediately. Historically, Landry acts with extreme urgency on high-priority conservative legislation and redistricting maps, often signing them within one to four days of legislative passage to capitalize on momentum.
4. Administrative Urgency and Deadlines The state faces immense pressure to finalize the map due to looming election administration deadlines. The Secretary of State requires significant lead time (the “ERIN” deadline) to code the new districts into the voter database before the candidate qualifying period begins in July or August. Governor Landry previously suspended congressional primaries specifically for this purpose, elevating the map to an “election emergency.”
5. Established Scenarios
Agent Forecast (date, confidence: medium)
Base Rate: Mid-session congressional redistricting in supermajority-aligned Republican southern states under hard adjournment deadlines: typical resolution 1-2 weeks from second-chamber introduction when governor is supportive. SB 121 entered House May 18; session ends June 1 (14 calendar days). Senate moved committee-to-floor in ~1 day, but House procedure tends to be slower; realistic House timeline is 5-10 days from committee hearing to final passage, plus 0-10 days for governor signature.
Initial Reasoning:
As of May 20, 2026, SB 121 is pending before the Louisiana House Governmental Affairs Committee, to which it was referred on May 19.
SB 121 (Louisiana’s new 5-1 Republi
Key Uncertainties:
Evidence Sources (21):
Grounding Facts (passed to reviewers): Here are 9 key grounding facts:
Draft: May 20, 2026 to May 30, 2026: 59.0%, May 30, 2026 to Jun 10, 2026: 28.0%, Jun 10, 2026 to Jun 20, 2026: 4.7%, Jun 20, 2026 to Jul 01, 2026: 2.3%, After Aug 12, 2026: 1.8%
Reviewer Panel:
Reviewer (reasoning)
The draft forecast hinges almost entirely on the assumption that Louisiana’s supermajority and the looming June 1 adjournment guarantee ultra-fast House action and a near-instant governor’s signature. This overlooks historical Louisiana redistricting timelines (often requiring special sessions) and procedural calendar rules that routinely delay committee referrals for weeks. The forecast thus underestimates the chance of slipping into a special session or into June.
Objections:
Reviewer (calibration)
The forecast places an extremely high probability on resolution within the next three weeks, heavily relying on the Republican supermajority and gubernatorial support. While these factors make passage likely, they may understate the potential for procedural delays, even if ultimately unsuccessful, that could push the timeline further into June or even July. The assumption of a rapid House process mirroring the Senate’s might be too optimistic for a contentious bill.
Objections:
Reviewer (fact-checker)
1 factual error(s). 3 unsupported claim(s). Verdict: minor_issues
Unsupported claims:
Objections:
Adjustment Rationale:
Adjusted downward in the May 20-30 bin (from ~0.59 average to 0.50) and upward in May 30-Jun 10 (from ~0.28 to 0.34) in response to both reviewers correctly noting overconfidence in the tightest window. The calibration reviewer was right that compressing committee vote, House floor passage, and governor signature into 10 calendar days — across a Memorial Day weekend — is aggressive even with a Republican supermajority. The reasoning reviewer’s base-rate point about Louisiana redistricting historically slipping to special sessions warranted a small bump in mid/late-June bins. Held the narrow interpretation (governor signature date controls). Did not move further toward the reviewers’ position because the underlying fundamentals remain strong: SB 121 is already in committee with a confirmed May 21 hearing, supermajority votes are guaranteed, the June 1 adjournment is a hard forcing function, and the governor is fully aligned. The fact-checker’s flagged claims (Senate pace timing, primary postponement, HB 842 signature) are corroborating-detail issues that don’t alter the core forecast.
forecast_sdk | 356.0s | research $1.4484 + reviewers $0.0083 + reconcile $0.2134 = $1.7079
Louisiana is most likely to give final legal approval on May 27, 2026 UTC; I put 96% on a qualifying approval before the August 12 cutoff.
SB121 is the live vehicle. The official bill page shows that it passed the Senate by 27-10 on May 14, was received in the House on May 18, was referred to House and Governmental Affairs on May 19, and remains pending there (Louisiana Legislature SB121). The reengrossed text enacts a new R.S. 18:1276, describes district assignments, references 2026 precinct shapefiles, and makes the 2026 election-use provisions effective on governor signature or on lapse of the governor’s action period (SB121 reengrossed text). If enacted, it qualifies.
Gov. Jeff Landry suspended only the U.S. House primaries on April 30 after the Supreme Court’s April 29 Callais decision and said the pause was to give the Legislature time to pass a new congressional map (governor statement). Act 7, signed on May 14, moved U.S. House races to the November 3 open primary cycle and set candidate qualifying for August 5-7 (Secretary of State release). That creates pressure to finish soon, but the legal approval trigger is still House passage, any Senate concurrence, enrollment, and governor action.
The historical backbone is thin but direct. Since the 2010 cycle, Louisiana has enacted three congressional district plans: 2011 HB6, 2022 HB1, and 2024 SB8. The aligned or cooperative cases moved fast after final legislative action; the divided-government 2022 case only became law after a veto override.
| Plan | Key legislative path | Final legal approval | Timing lesson |
|---|---|---|---|
| 2011 HB6, Act 2 | House passed April 4; Senate amended and House concurred April 13 (HB6 history) | Governor signed April 14 (HB6 history) | 10 days from first chamber passage; 1 day from final legislative action |
| 2022 HB1, Act 5 | House passed February 10; Senate passed and House concurred February 18; governor vetoed March 10; both chambers overrode March 30 (HB1 history) | Became Act 5 on March 31 (HB1 history) | 49 days from first chamber passage because the governor opposed it |
| 2024 SB8, Act 2 | Senate passed January 17; House passed and Senate concurred January 19 (SB8 history) | Governor signed January 22 (SB8 history) | 5 days from first chamber passage; 3 days from final legislative action |
SB121 looks much closer to 2011 and 2024 than to 2022. Louisiana has unified Republican control; NCSL’s May 19 update lists the House at 70 Republicans, 29 Democrats, and 6 vacancies, the Senate at 28 Republicans, 10 Democrats, and 1 vacancy, and Republican control of the legislature and governorship (NCSL partisan composition). The Senate has already passed SB121 by 27-10 (Louisiana Legislature SB121). The House is the bottleneck.
The strongest timing signal is mixed. The May 19 House and Governmental Affairs agenda did not include SB121, and that meeting is marked adjourned (May 19 HGA agenda). The official House schedule early on May 20 listed a House floor session and several other committees, but not House and Governmental Affairs; the statewide scheduled-meetings page likewise did not show an HGA meeting among upcoming meetings (House schedule; scheduled meetings). Against that, the Power Coalition notice told supporters to attend House and Governmental Affairs on May 21 for SB121 (Power Coalition notice), and a May 2026 Invest in Louisiana summary quoted reporting that Speaker Phillip DeVillier expected a similar House map while HGA chair Beau Beaullieu expected to hear SB121 sometime the next week, with no date set (Invest in Louisiana). I read this as a likely committee hearing by May 21 or May 26, not an immediate May 20 finish.
The governor-action tail is small. Louisiana’s regular session must adjourn no later than 6:00 p.m. Central on June 1 (2026 session page), and third reading and final passage after 6:00 p.m. on May 29 needs a two-thirds vote absent consent or extension (2026 Senate bulletin). Once a bill is delivered, it becomes law if the governor signs it, or if he does not sign or veto within 10 days while the session remains active, or within 20 days if the tenth day falls after adjournment (Louisiana Constitution art. III, sec. 18). Since Landry signed the election-calendar Act 7 on May 14 and publicly tied the suspension to legislative mapmaking, I expect a quick signature if SB121 reaches him (Secretary of State release; governor statement).
My event-chain forecast puts 71% on approval by May 29, 84% by June 1, 91% by June 5, 94% by June 21, and 96% before the August 12 cutoff. The largest single-date masses are May 27 at 18%, May 28 at 17%, May 29 at 14%, and May 26 at 13%. The 4% upper tail covers a House breakdown over parish splits, an amended bill that fails to clear both chambers, a court-only map path that does not count under the resolution criteria, or a public-record ambiguity.
The Senate vote makes the bill look almost done, but the House committee timing is doing most of the work. SB121 arrived too late for the May 19 HGA agenda, and no official HGA meeting was visible early on May 20 (SB121 history; May 19 HGA agenda; scheduled meetings). That is why I do not make May 22 the mode, even though an advocacy notice points to May 21 testimony (Power Coalition notice).
The August 12 cutoff is not the main clock. The real clock is the June 1 session end and the election-administration need to have districts settled before August candidate qualifying (2026 session page; Secretary of State election calendar). A later court injunction could affect use of the map, but a Louisiana state-law approval would still be the resolution event as written.
I could not verify an official May 21 House and Governmental Affairs agenda listing SB121. The advocacy notice is a real signal, but official state records control, and the official schedule can change quickly (Power Coalition notice; scheduled meetings). The biggest substantive uncertainty is whether the House amends SB121. A clean House passage can go straight to enrollment and the governor; a House amendment requires Senate concurrence and could add several days or a conference committee. Public record lag is also a minor issue: the Secretary of State said Act 7 was signed by Landry on May 14, while the Legislature bill-status page for HB842 still emphasized legislative signatures rather than the governor’s signature (Secretary of State release; HB842 status).
Forecast (median): June 1, 2026
Louisiana’s SB 121 redistricting bill passed the state Senate on May 14 and was referred to the House committee on May 19. The critical constraint is the May 29 regular-session final-passage deadline. Governor Landry has publicly committed to signing immediately. With Republican supermajorities and clear urgency (candidate qualifying opens August 5), the most likely scenario is House passage by late May and gubernatorial signature by early June.
House committee and floor timing (40% weight): The bill must pass both committee and full House by May 29 or require a special session. Tennessee’s precedent (map signed May 7 post-ruling) and SB 210’s 3-day enrollment-to-signing lag suggest rapid movement is feasible.
Governor’s signing speed (25% weight): Landry has signaled strong support and urgency. SB 210 precedent shows ~3 days from enrollment to signature; faster signing is plausible given the August 5–7 qualifying deadline.
Republican supermajority control (20% weight): Democrats cannot obstruct; passage is near-certain if the bill reaches the floor. The main uncertainty is procedural timing, not political viability.
Litigation risk (12% weight): Multiple lawsuits target the executive order suspending primaries, but the Supreme Court’s April 29 ruling explicitly authorized Louisiana to “enact a Constitutionally compliant map.” No current injunction against SB 121 is reported.
Special session contingency (3% weight): If the bill misses the May 29 deadline, a special session would be required, pushing approval to early June or later—but this is unlikely given political alignment.
| Scenario | Probability | Central Date | Range | |———-|
When will Louisiana give final legal approval to a new U.S. House district plan?
Key figures
Historical context
Louisiana’s redistricting history is defined by frequent judicial intervention and legislative-executive tension. In 2022, the legislature passed a map with one majority-Black district, which Governor John Bel Edwards (a Democrat) vetoed. The legislature then overrode that veto—a rare occurrence in state history. This map was later challenged and replaced by SB8 in early 2024, which created a second majority-Black district. However, following the U.S. Supreme Court’s April 29, 2026 ruling in Louisiana v. Callais, that 2024 map was struck down as a racial gerrymander. The current 2026 push is unique due to the alignment between Governor Jeff Landry and the Republican-controlled legislature, which has historically allowed for much faster legislative turnarounds than during periods of divided government. The urgency is further heightened by the proximity to the 2026 midterms, mirroring the ‘emergency’ redistricting seen in states like Alabama and Georgia in previous cycles.
Tailwinds
Headwinds
Detailed reasoning
The forecast for Louisiana’s final legal approval of a new U.S. House district plan is primarily driven by the rigid constitutional deadlines of the state’s legislative session and the intense political pressure following a 2026 U.S. Supreme Court ruling. On April 29, 2026, the Supreme Court invalidated Louisiana’s previous map (SB8), which contained two majority-Black districts, citing it as an unconstitutional racial gerrymander. This created an immediate legal vacuum for the 2026 midterm elections. My analysis weights the current legislative progress of Senate Bill 121 (SB121) as the most critical factor. SB121, which proposes a map with only one majority-Black district to comply with the ruling, has already cleared the Senate (May 14, 2026) and moved to the House. With the House expected to take up the bill on May 21, the path to passage is highly expedited.
The median prediction of May 26, 2026, reflects a scenario where the House passes the bill within 2-3 days of floor consideration, followed by a swift signature from Governor Jeff Landry. Governor Landry has demonstrated his commitment to this timeline by issuing executive orders to postpone primaries and coordinating with the Attorney General to bypass standard judicial waiting periods. The legislative session must adjourn by June 1, 2026, at 6:00 p.m. Historically, redistricting bills in Louisiana during active sessions are either finalized in the penultimate week or during a last-minute push before adjournment. Given that SB121 is already in the House committee stage as of May 20, a “final approval” date between May 23 and May 31 is the highest-probability window.
I have also considered the legal mechanisms for “final legal approval.” While a gubernatorial signature is the most likely path given Landry’s vocal support for the Republican-led map, the forecast accounts for the “enactment without signature” provision. If the Governor does not sign or veto the bill within 10 days of delivery during the session, it becomes law automatically. However, given the political stakes and the need for administrative certainty before the August qualifying period, a proactive signature is the dominant expected outcome. The small tail of probability extending into June and July accounts for potential special sessions or last-minute legislative amendments that might necessitate a conference committee, but the 90% confidence signal from external markets like Polymarket reinforces the expectation of a successful, near-term resolution.
Key uncertainties
Conclusion