Blue wave in 2026 stays heavily favored ahead of midterms

Name: Blue wave in 2026 stays heavily favored ahead of midterms
Creator: ClearMarket
Published: 2026-10-31T00:00:00.000Z
License: https://creativecommons.org/licenses/by/4.0/

Polymarket 89%

record: CMSIG2026103104 | category: momentum-repricing | target: CM-EVT-4N4F192YB2 | published: 2026-10-31

4-bullet brief | narrative

Polymarket prices a blue wave in 2026 at 89%; Kalshi's parallel contract sits at 85%, both heavily favoring a Democratic sweep.
Wall Street's expectation of sweeping Democratic gains is fully consistent with prediction market pricing, with both venues showing near-consensus odds.
A blue tsunami (larger sweep) is priced at 64% on Kalshi, suggesting the market sees the wave as likely but not certain to be historically large.
Republicans controlling at least one chamber sits at 70% on a separate Kalshi contract, revealing residual uncertainty, the market does not yet fully close the door on a partial GOP hold.

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: CNBC reports Wall Street is bracing for sweeping Democratic gains in next week's 2026 midterm elections based on surging polls.exa_search → Garrett Downs · as_of 2026-11-01T07:48:20+00:00
publisher: Garrett Downs
published_at: 2026-10-31T00:00:00.000Z
source_url: https://www.cnbc.com/2026/10/30/2026-midterm-election-wall-street-prepares-for-democratic-gains.html

[02] pm_response

interp: Polymarket and Kalshi both carry live contracts; the 4-point Polymarket/Kalshi gap is narrow and within normal cross-venue noise.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-89-kalshi-85-2026-10-31/`
JSON	REST API for developers	`https://clearmarket.fyi/signals/blue-wave-2026-polymarket-89-kalshi-85-2026-10-31.json`
MCP	agentic AI tool call (Claude Desktop, Cursor, Continue)	`clearmarket.get_signal("blue-wave-2026-polymarket-89-kalshi-85-2026-10-31")`
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": "CMSIG2026103104",
  "published_at": "2026-10-31T00:00:00.000Z",
  "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 a blue wave in 2026 at 89%; Kalshi's parallel contract sits at 85%, both heavily favoring a Democratic sweep.",
    "Wall Street's expectation of sweeping Democratic gains is fully consistent with prediction market pricing, with both venues showing near-consensus odds.",
    "A blue tsunami (larger sweep) is priced at 64% on Kalshi, suggesting the market sees the wave as likely but not certain to be historically large.",
    "Republicans controlling at least one chamber sits at 70% on a separate Kalshi contract, revealing residual uncertainty, the market does not yet fully close the door on a partial GOP hold."
  ],
  "atomic_claims": [
    {
      "type": "news_event",
      "field_provenance": {
        "story": {
          "tier": "mediated",
          "method": "exa_search",
          "source": "Garrett Downs",
          "source_url": "https://www.cnbc.com/2026/10/30/2026-midterm-election-wall-street-prepares-for-democratic-gains.html",
          "retrieved_at": "2026-11-01T07:48:20+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": "CNBC reports Wall Street is bracing for sweeping Democratic gains in next week's 2026 midterm elections based on surging polls.",
      "publisher": "Garrett Downs",
      "published_at": "2026-10-31T00:00:00.000Z",
      "source_url": "https://www.cnbc.com/2026/10/30/2026-midterm-election-wall-street-prepares-for-democratic-gains.html"
    },
    {
      "type": "pm_response",
      "field_provenance": {
        "notes": {
          "tier": "editorial",
          "method": "llm_judge_cm_signal_v1"
        }
      },
      "notes": "Polymarket and Kalshi both carry live contracts; the 4-point Polymarket/Kalshi gap is narrow and within normal cross-venue noise."
    }
  ],
  "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": "Garrett Downs: Wall Street braces for Democratic gains as 2026 midterm election nears",
      "url": "https://www.cnbc.com/2026/10/30/2026-midterm-election-wall-street-prepares-for-democratic-gains.html",
      "published_at": "2026-10-31T00:00:00.000Z",
      "retrieved_at": "2026-11-01T07:48:20+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 CMSIG2026103104 published 2026-10-31T00:00:00.000Z signature sha256-445e3f60481… ← underlying event all signals →