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Sources

Every news outlet, social platform, legislative API, and prediction market the Political Temperature Index ingests. Bias bucket follows the AllSides 5-category scheme (Left / Lean Left / Center / Lean Right / Right). We do not pay for outlet inclusion and we do not weight individual outlets in volume, polarization, intensity, or friction. The 30-day share column shows the observed ingestion mix.

2180 listed2125 active1224 with articles in last 30 daysJSON API ↗

Sub-index weights (composite temperature)

30%Volume
30%Polarization
20%Intensity
10%Rhetoric
10%Friction

These five sub-indices are weighted to produce the daily composite. Individual outlets are not weighted in volume, polarization, intensity, or friction (every article counts once). Rhetoric, the 10% sub-index, multiplies each article's toxicity / inflammatory / GDELT-tone signal by sources.reliability_score, so higher-reliability outlets carry more influence in that sub-score. The reliability column on this page surfaces the values that drive it.

Bias balance

Two views of the same data. Source-count balance tells you how many distinct news + commentary outlets we ingested from in each bucket over the last 30 days; article-share balance weights by how many articles each outlet produced. Both views exclude (a) institutional sources like the White House Briefing Room, which carry no polarization signal by design, and (b) social platform rows (Reddit, YouTube), which contribute to polarization scoring through social_posts but are counted separately so one large platform doesn't skew the news-outlet mix. Dormant outlets (no articles in the window) are also excluded so the bars reflect the active mix, not the registered mix.

Source-count balance (distinct active outlets, last 30 days)

42%
38%
11%
Left
40 outlets
Lean Left
501 outlets
Center
456 outlets
Lean Right
132 outlets
Right
71 outlets

Article-share balance (volume-weighted 30-day mix)

8%
23%
25%
8%
35%
Left
8.4%
Lean Left
22.6%
Center
25.4%
Lean Right
8.5%
Right
35.2%
Asymmetry drivers. Today the source-count balance is 28pp tilt toward Left + Lean Left. When the Left + Lean Left buckets outnumber Right + Lean Right, it usually reflects that more state/local newspapers and Substack commentary in our registry classify as lean-left than as lean-right, not a curation thumb on the scale. The Right and Lean Right outlets we do ingest often publish at higher article volumes per outlet (see the per-outlet share in the table below) — which is why the article-share balance is closer than the outlet-count balance. We surface both so you can judge for yourself.

50,292 articles in the last 30 days attributed to a listed outlet (these are what the bars above are weighted by).

16,898 (25.1%) ingested with no source attribution. This is a mix of two things: (a) genuine long-tail outlets we haven't curated yet (mostly via GDELT scraping the wider web), and (b) outlets that ARE in our registry but failed our domain-matching during ingest. We re-run attribution periodically to narrow the gap; the roadmap below tracks expansion.

108 articles came from institutional sources (agency_press_release, federal_register) that intentionally don't carry a polarization signal.

Outlet registry

1224 of 2180 sources
CategoryIntegration
r/politics
Left-1.5 · seed-sources
social—
9.97%5,014 articles· #1
Reddit (Arctic-Shift)
r/Conservative
Right+2 · seed-sources
social—
5.70%2,869 articles· #2
Reddit (Arctic-Shift)
The Hillthehill.com
Center0 · seed-sources
news0.75
5.61%2,822 articles· #3
RSS Aggregator
r/news
Lean Left-0.5 · seed-sources
social—
5.48%2,757 articles· #4
Reddit (Arctic-Shift)
r/PoliticalHumor
Left-1.5 · seed-sources
social—
4.69%2,360 articles· #5
Reddit (Arctic-Shift)
r/conservatives
Right+1.5 · seed-sources
social—
4.35%2,188 articles· #6
Reddit (Arctic-Shift)
Breitbartbreitbart.com
Right+3 · seed-sources
news0.40
3.38%1,702 articles· #7
RSS Aggregator
The Guardian UStheguardian.com
Left-1.5 · seed-sources
news0.75
3.09%1,553 articles· #8
auto-ingested
Raw Storyrawstory.com
Left-2 · seed-sources
news0.50
2.95%1,482 articles· #9
RSS Aggregator
r/law
Center0 · seed-sources
social—
2.63%1,323 articles· #10
Reddit (Arctic-Shift)
r/AskConservatives
Lean Right+0.5 · seed-sources
social—
2.47%1,244 articles· #11
Reddit (Arctic-Shift)
r/neoliberal
Lean Left-0.5 · seed-sources
social—
2.31%1,164 articles· #12
Reddit (Arctic-Shift)
r/socialism
Left-2.5 · seed-sources
social—
2.26%1,139 articles· #13
Reddit (Arctic-Shift)
Las Vegas Review-Journalreviewjournal.com
Lean Right+1 · seed-sources
news0.65
2.14%1,074 articles· #14
RSS Aggregator
RealClearPoliticsrealclearpolitics.com
Center0 · seed-sources
news0.70
2.02%1,016 articles· #15
RSS Aggregator
r/LateStageCapitalism
Left-3 · seed-sources
social—
1.94%977 articles· #16
Reddit (Arctic-Shift)
The Ben Shapiro Showdailywire.com/show/the-ben-shapiro-show
Right+2 · seed-sources
news0.55
1.87%941 articles· #17
RSS Aggregator
Townhalltownhall.com
Right+2 · seed-sources
news0.50
1.87%941 articles· #18
RSS Aggregator
CBS Newscbsnews.com
Lean Left-0.5 · seed-sources
news0.80
1.82%913 articles· #19
auto-ingested
NBC Newsnbcnews.com
Lean Left-1 · seed-sources
news0.75
1.62%817 articles· #20
RSS Aggregator
New York Postnypost.com
Right+1.5 · seed-sources
news0.55
1.60%806 articles· #21
RSS Aggregator
BizPac Reviewbizpacreview.com
Right+2 · seed-sources
news0.45
1.57%792 articles· #22
RSS Aggregator
New York Timesnytimes.com
Lean Left-1 · seed-sources
news0.85
1.56%787 articles· #23
auto-ingested
Fox Businessfoxbusiness.com
Right+1.5 · seed-sources
news0.60
1.55%780 articles· #24
auto-ingested
r/Economics
Center0 · seed-sources
social—
1.47%737 articles· #25
Reddit (Arctic-Shift)
RedStateredstate.com
Right+2 · seed-sources
news0.45
1.41%708 articles· #26
RSS Aggregator
r/AskALiberal
Lean Left-0.5 · seed-sources
social—
1.38%695 articles· #27
Reddit (Arctic-Shift)
The Western Journalwesternjournal.com
Right+2.5 · seed-sources
news0.40
1.36%682 articles· #28
RSS Aggregator
PJ Mediapjmedia.com
Right+2 · seed-sources
news0.50
1.35%679 articles· #29
RSS Aggregator
Politicopolitico.com
Lean Left-0.5 · seed-sources
news0.80
1.33%671 articles· #30
auto-ingested
Daily Callerdailycaller.com
Right+2 · seed-sources
news0.50
1.33%669 articles· #31
RSS Aggregator
r/democrats
Left-2 · seed-sources
social—
1.30%656 articles· #32
Reddit (Arctic-Shift)
Yahoo Newsyahoo.com
Center0 · seed-sources
news0.50
1.24%622 articles· #33
auto-ingested
Washington Examinerwashingtonexaminer.com
Right+1.5 · seed-sources
news0.60
1.22%615 articles· #34
RSS Aggregator
Washington Timeswashingtontimes.com
Right+1.5 · seed-sources
news0.60
1.21%607 articles· #35
RSS Aggregator
r/uspolitics
Lean Left-0.5 · seed-sources
social—
1.20%605 articles· #36
Reddit (Arctic-Shift)
PBSpbs.org
Center0 · seed-sources
news0.85
1.13%567 articles· #37
RSS Aggregator
LifeZettelifezette.com
Right+2 · seed-sources
news0.45
1.11%559 articles· #38
RSS Aggregator
r/PoliticalDiscussion
Center0 · seed-sources
social—
1.11%558 articles· #39
Reddit (Arctic-Shift)
Just The Newsjustthenews.com
Right+2 · seed-sources
news0.50
1.07%536 articles· #40
RSS Aggregator
Volokh Conspiracyreason.com/volokh
Lean Right+0.5 · seed-sources
news0.65
1.06%534 articles· #41
RSS Aggregator
Washington Postwashingtonpost.com
Lean Left-1 · seed-sources
news0.85
1.05%530 articles· #42
RSS Aggregator
The Daily Signaldailysignal.com
Right+2 · seed-sources
news0.55
1.04%525 articles· #43
RSS Aggregator
Wirecutternytimes.com/wirecutter
Lean Left-0.3 · seed-sources
news0.70
1.04%525 articles· #44
RSS Aggregator
Reutersreuters.com
Center0 · seed-sources
news0.95
1.00%504 articles· #45
auto-ingested
LifeSite Newslifesitenews.com
Right+2.5 · seed-sources
news0.40
0.98%495 articles· #46
RSS Aggregator
CNNcnn.com
Lean Left-1 · seed-sources
news0.70
0.94%474 articles· #47
auto-ingested
Associated Pressapnews.com
Center0 · seed-sources
news0.95
0.89%450 articles· #48
auto-ingested
Hot Airhotair.com
Right+2 · seed-sources
news0.50
0.85%428 articles· #49
RSS Aggregator
Fox Newsfoxnews.com
Right+2 · seed-sources
news0.55
0.80%403 articles· #50
auto-ingested
Page 1 of 25

Sources we tried but cannot ingest

Sources we evaluated and could not use directly, typically because of API policy changes or coverage that doesn't fit the scoring model. Documented here so the absence is visible.

  • MBFC

    Cross-validation

    Free tier insufficient (3 req/month). Use scripts/seed-sources.ts and scripts/import-allsides.ts instead

    requires: RAPIDAPI_KEY

    disabled

  • ProPublica Congress

    Legislative

    Shut down July 2024. Replaced by congressional-record.ts (Congress.gov API)

    deprecated

  • PredictIt

    Elections

    Replaced by Polymarket

    deprecated

  • ACLED

    Cross-validation

    API key cannot be obtained for small projects

    unavailable

Planned additions

Sources with code already written that aren't yet wired into a daily job, plus sources we're actively trying to add. See docs/future-work/source-coverage-gaps.md for the gap-close backlog (Spanish-language outlets, Crowd Counting Consortium, deeper non-coastal local coverage).

  • CourtListener

    Legislative
    planned

  • Google Civic

    Legislative

    requires: GOOGLE_CIVIC_API_KEY

    planned

  • GAO Reports

    Legislative
    planned

  • SCOTUSblog

    Legislative
    planned

  • Congressional XML

    Legislative
    planned

  • Snopes

    Cross-validation
    planned

  • Voteview

    Cross-validation
    planned

  • Wikipedia Pageviews

    Cross-validation
    planned

  • GDELT TV

    Cross-validation
    planned

  • BLS

    Economic

    requires: BLS_API_KEY

    planned

  • FRED

    Economic

    requires: FRED_API_KEY

    planned

  • Treasury Fiscal Data

    Economic
    planned

  • USAspending

    Economic
    planned

Methodology notes

30-day share is descriptive ingestion, not total influence. Each article counts once in volume, polarization, intensity, and friction (90% of the composite). The share column shows what fraction of articles attributed to a listed outlet came from each one over the last 30 days.

Rhetoric (10% of the composite) does weight by reliability. Inside the rhetoric sub-score, each article's toxicity, inflammatory, and GDELT-tone signal is multiplied by sources.reliability_score (default 0.5 for unknown sources). Higher-reliability outlets therefore carry more weight in that one sub-index. The reliability column on this page surfaces the values that drive it. This is the only place outlet-level weighting happens in scoring.

The 5-bucket display is wider than the runtime polarization classifier. Internally, polarization scoring uses a 3-bucket left / center / right classifier with a ±0.3 center band, so an outlet with bias_score = +0.28 displays as Lean Right here but scores as Center in polarization. The display taxonomy exists to communicate finer gradations to the public; it is not the same as the scoring taxonomy.

Bias provenance is recorded per row. seed-sources = numeric bias_score from our curated outlet table; allsides = AllSides string rating; mbfc = Media Bias / Fact Check; rss-lean = the lean field on the RSS feed entry when no other signal exists; institutional-default = institutional / agency sources that don't carry a polarization signal.

See the full methodology for the composite math, the EMA smoothing chain, and event detection. The machine-readable version of this page is at /api/sources.