Blue wave in 2026 stays heavily favored on Polymarket

Name: Blue wave in 2026 stays heavily favored on Polymarket
Creator: ClearMarket
Published: 2026-10-25T07:02:00.000Z
License: https://creativecommons.org/licenses/by/4.0/

Polymarket 87%

record: CMSIG2026102506 | category: momentum-repricing | target: CM-EVT-4N4F192YB2 | published: 2026-10-25

4-bullet brief | narrative

Polymarket prices an 87% chance of a blue wave in 2026, while Kalshi's blue tsunami contract (CM-EVT-6CY3Y4C610) sits lower at 57%.
The framing of the midterms as a referendum on the Trump administration is consistent with strong Democratic market odds, though the definition gap between 'wave' and 'tsunami' explains the spread.
The 30-point gap between Polymarket's blue wave (87%) and Kalshi's blue tsunami (57%) likely reflects definitional thresholds, tsunami implying a larger seat-gain threshold.
Polymarket's Democrats-win-all-four-core-Senate-races contract (CM-EVT-P54SDG6NP7) sits at 62%, the tightest constraint on the full wave scenario.

atomic briefs | structured for retrieval

[01] news_event

significance

surfaced in the daily Exa news-cycle scan; mechanically matched to an active polymarket market

story: A Guardian analysis frames the US midterms as one of four pivotal global elections in 10 days where democratic norms are at stake, with authoritarian backsliding as the central question.exa_search → Julian Borger senior international correspondent · as_of 2026-10-25T07:48:12+00:00
publisher: Julian Borger senior international correspondent
published_at: 2026-10-25T07:02:00.000Z
source_url: https://www.theguardian.com/world/ng-interactive/2026/oct/25/ten-days-shake-world-democratic-norms-pivotal-elections-brazil-israel-serbia-us

[02] pm_response

interp: Polymarket and Kalshi carry separate blue wave and blue tsunami contracts with materially different resolution definitions, producing a 30-point spread worth monitoring for arbitrage signals.llm_judge_cm_signal_v1

evaluation

News-cycle wires publish on coverage, not editorial selection — the day’s top stories matched to the prediction markets pricing them, so nothing is cherry-picked.

judge_engine: none — deterministic news-cycle scan
judge_verdict: auto_published
judge_confidence: n/a — no judge gate (deterministic publishing)
prompt_template: news_cycle_v1 github · auditable
match_method: entity_slug_match (mechanical)

citation graph

Every wire traces back to the ClearMarket event it is built on, and out to each venue’s own market page — so any figure here can be verified at its source.

internal

cm_event: /events/blue-wave-in-2026/

external

venue_a: polymarket · 0xed4fd09a24f20a3afc1d722ace811fffff3cffd9a56a3fbffc47f4d3d47a88ed

programmatic access · four surfaces, same payload

AI grounded search reads embedded JSON-LD in HTML. Developers query REST. Agentic AI clients (Claude Desktop, Cursor) call MCP tools. AI crawlers index via /llms.txt. Same canonical record at every surface.

HTML	browsers, AI grounded search, crawlers (contains embedded JSON-LD `@type: Dataset`)	`https://clearmarket.fyi/signals/blue-wave-2026-polymarket-87-tsunami-at-57-2026-10-25/`
JSON	REST API for developers	`https://clearmarket.fyi/signals/blue-wave-2026-polymarket-87-tsunami-at-57-2026-10-25.json`
MCP	agentic AI tool call (Claude Desktop, Cursor, Continue)	`clearmarket.get_signal("blue-wave-2026-polymarket-87-tsunami-at-57-2026-10-25")`
AGENT	AI crawler discovery index	`/llms.txt`

 PM data: platform APIs (hourly refresh). News context: retrieved with source citations. Editorial judgment: LLM judge with prompt template versioned per wire type. Per-claim provenance inline above; full per-field provenance map at the JSON endpoint under field_provenance.
  raw JSON record · same payload returned by REST endpoint
 {
  "$schema": "https://clearmarket.fyi/schema/signal/v1.json",
  "provenance_version": "0.2.0",
  "record_id": "CMSIG2026102506",
  "published_at": "2026-10-25T07:02:00.000Z",
  "detection": "news_cycle",
  "category_tag": "MOMENTUM_REPRICING",
  "secondary_tags": [],
  "pre_news_classification": "concurrent",
  "target_event_id": "CM-EVT-4N4F192YB2",
  "target_event_slug": "blue-wave-in-2026",
  "event_question": "Will there be a blue wave in 2026?",
  "bullets": [
    "Polymarket prices an 87% chance of a blue wave in 2026, while Kalshi's blue tsunami contract (CM-EVT-6CY3Y4C610) sits lower at 57%.",
    "The framing of the midterms as a referendum on the Trump administration is consistent with strong Democratic market odds, though the definition gap between 'wave' and 'tsunami' explains the spread.",
    "The 30-point gap between Polymarket's blue wave (87%) and Kalshi's blue tsunami (57%) likely reflects definitional thresholds, tsunami implying a larger seat-gain threshold.",
    "Polymarket's Democrats-win-all-four-core-Senate-races contract (CM-EVT-P54SDG6NP7) sits at 62%, the tightest constraint on the full wave scenario."
  ],
  "atomic_claims": [
    {
      "type": "news_event",
      "field_provenance": {
        "story": {
          "tier": "mediated",
          "method": "exa_search",
          "source": "Julian Borger senior international correspondent",
          "source_url": "https://www.theguardian.com/world/ng-interactive/2026/oct/25/ten-days-shake-world-democratic-norms-pivotal-elections-brazil-israel-serbia-us",
          "retrieved_at": "2026-10-25T07:48:12+00:00"
        }
      },
      "significance": {
        "threshold": 5,
        "threshold_unit": "rank",
        "passed": true,
        "reason": "surfaced in the daily Exa news-cycle scan; mechanically matched to an active polymarket market"
      },
      "story": "A Guardian analysis frames the US midterms as one of four pivotal global elections in 10 days where democratic norms are at stake, with authoritarian backsliding as the central question.",
      "publisher": "Julian Borger senior international correspondent",
      "published_at": "2026-10-25T07:02:00.000Z",
      "source_url": "https://www.theguardian.com/world/ng-interactive/2026/oct/25/ten-days-shake-world-democratic-norms-pivotal-elections-brazil-israel-serbia-us"
    },
    {
      "type": "pm_response",
      "field_provenance": {
        "notes": {
          "tier": "editorial",
          "method": "llm_judge_cm_signal_v1"
        }
      },
      "notes": "Polymarket and Kalshi carry separate blue wave and blue tsunami contracts with materially different resolution definitions, producing a 30-point spread worth monitoring for arbitrage signals."
    }
  ],
  "evaluation": {
    "judge_engine": "none — deterministic news-cycle scan",
    "judge_verdict": "auto_published",
    "judge_confidence": null,
    "prompt_template": "news_cycle_v1"
  },
  "citations": {
    "internal": {
      "cm_event": "/events/blue-wave-in-2026/",
      "related": []
    },
    "external": {
      "venue_a": null,
      "venue_b": null,
      "benchmark": null
    }
  },
  "sources": [
    {
      "label": "Julian Borger senior international correspondent: Ten days that could shake the world: democratic norms at stake in four",
      "url": "https://www.theguardian.com/world/ng-interactive/2026/oct/25/ten-days-shake-world-democratic-norms-pivotal-elections-brazil-israel-serbia-us",
      "published_at": "2026-10-25T07:02:00.000Z",
      "retrieved_at": "2026-10-25T07:48:12+00:00"
    }
  ],
  "field_provenance": {
    "pm_data": "polymarket_api",
    "news_context": "exa_search",
    "editorial_judgment": "cm_signal_llm_judge"
  }
}
 
   PROVENANCE PROTOCOL v0.2 · [direct] venue api · [mediated] grounded web fetch + source url · [derived] computed from listed inputs · [editorial] versioned llm judgment · full spec /schema/provenance/v1

record CMSIG2026102506 published 2026-10-25T07:02:00.000Z signature sha256-83bb0aff3ce… ← underlying event all signals →