CM ClearMarket
SYSTEM: LIVE · PRICES: HOURLY REFRESH · COVERAGE: ~3,860 EVENTS / ~39,200 MARKETS · KALSHI + POLYMARKET

Democrats sweep four core Senate races stays near 50%

Polymarket 55%
record: CMSIG2026100302 | category: momentum-repricing | target: CM-EVT-P54SDG6NP7 | published: 2026-10-03
4-bullet brief | narrative
  • Polymarket prices 55% on Democrats winning all four core Senate races, a slim majority-leaning read with no decisive lean.
  • Poll data showing Democratic momentum in Republican-leaning districts is broadly consistent with the near-50% pricing, not a clear market mismatch.
  • Kalshi's companion contract on the same sweep question sits at 53%, showing tight cross-venue alignment and little arbitrage gap.
  • Resolution requires Democrats to win all four races; a single loss collapses the contract to zero, which explains the discount from a straight single-race favorite read.
atomic briefs
[01] news_event
significance
surfaced in the daily Exa news-cycle scan; mechanically matched to an active polymarket market
story
A new midterm poll suggests Democrats may be making inroads in traditional Republican strongholds ahead of the November 3 elections.exa_search → Muskan Singh · as_of 2026-10-04T07:47:36+00:00
[mediated]
publisher
Muskan Singh
published_at
2026-10-03T00:00:00.000Z
[02] pm_response
interp
Polymarket at 55% and Kalshi at 53% are in close agreement, reflecting genuine uncertainty rather than a consensus directional call on the Senate sweep.llm_judge_cm_signal_v1
[editorial]
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.

external
venue_a
polymarket · 0x096f26b2abcfde3ee7863e7916ca17682522715f7631debd4878a43ee6c797a9
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.

HTMLbrowsers, AI grounded search, crawlers (contains embedded JSON-LD @type: Dataset)https://clearmarket.fyi/signals/dems-sweep-four-core-senate-races-polymarket-55-2026-10-03/
JSONREST API for developershttps://clearmarket.fyi/signals/dems-sweep-four-core-senate-races-polymarket-55-2026-10-03.json
MCPagentic AI tool call (Claude Desktop, Cursor, Continue)clearmarket.get_signal("dems-sweep-four-core-senate-races-polymarket-55-2026-10-03")
AGENTAI 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": "CMSIG2026100302",
  "published_at": "2026-10-03T00:00:00.000Z",
  "detection": "news_cycle",
  "category_tag": "MOMENTUM_REPRICING",
  "secondary_tags": [],
  "pre_news_classification": "concurrent",
  "target_event_id": "CM-EVT-P54SDG6NP7",
  "target_event_slug": "will-democrats-win-all-core-four-senate-races",
  "event_question": "Will Democrats win all four core Senate races?",
  "bullets": [
    "Polymarket prices 55% on Democrats winning all four core Senate races, a slim majority-leaning read with no decisive lean.",
    "Poll data showing Democratic momentum in Republican-leaning districts is broadly consistent with the near-50% pricing, not a clear market mismatch.",
    "Kalshi's companion contract on the same sweep question sits at 53%, showing tight cross-venue alignment and little arbitrage gap.",
    "Resolution requires Democrats to win all four races; a single loss collapses the contract to zero, which explains the discount from a straight single-race favorite read."
  ],
  "atomic_claims": [
    {
      "type": "news_event",
      "field_provenance": {
        "story": {
          "tier": "mediated",
          "method": "exa_search",
          "source": "Muskan Singh",
          "source_url": "https://economictimes.indiatimes.com/news/international/us/u-s-midterm-elections-2026-are-democrats-finally-making-a-comeback-in-republican-strongholds-heres-what-a-new-midterm-poll-shows/articleshow/134664760.cms",
          "retrieved_at": "2026-10-04T07:47:36+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 new midterm poll suggests Democrats may be making inroads in traditional Republican strongholds ahead of the November 3 elections.",
      "publisher": "Muskan Singh",
      "published_at": "2026-10-03T00:00:00.000Z",
      "source_url": "https://economictimes.indiatimes.com/news/international/us/u-s-midterm-elections-2026-are-democrats-finally-making-a-comeback-in-republican-strongholds-heres-what-a-new-midterm-poll-shows/articleshow/134664760.cms"
    },
    {
      "type": "pm_response",
      "field_provenance": {
        "notes": {
          "tier": "editorial",
          "method": "llm_judge_cm_signal_v1"
        }
      },
      "notes": "Polymarket at 55% and Kalshi at 53% are in close agreement, reflecting genuine uncertainty rather than a consensus directional call on the Senate sweep."
    }
  ],
  "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/will-democrats-win-all-core-four-senate-races/",
      "related": []
    },
    "external": {
      "venue_a": null,
      "venue_b": null,
      "benchmark": null
    }
  },
  "sources": [
    {
      "label": "Muskan Singh: Midterm polls: U.S. midterm elections 2026: Are Democrats finally maki",
      "url": "https://economictimes.indiatimes.com/news/international/us/u-s-midterm-elections-2026-are-democrats-finally-making-a-comeback-in-republican-strongholds-heres-what-a-new-midterm-poll-shows/articleshow/134664760.cms",
      "published_at": "2026-10-03T00:00:00.000Z",
      "retrieved_at": "2026-10-04T07:47:36+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 CMSIG2026100302 published 2026-10-03T00:00:00.000Z signature sha256-a80ba438a5a… ← underlying event all signals →