Data domains
One topic system across every venue of American politics, ordered the way Baumgartner and Jones read the policy process: from the signals that reach the system, through the institutions that take them up, to the decisions and dollars at the end. Friction rises at every step.
Progressive friction
Why the domains below are in this order, and not alphabetical.
A signal — a problem worsening, a story breaking, the public naming something as the country's most important problem — does not travel through government unimpeded. Every step charges a toll: someone has to notice it, an institution has to give it scarce agenda space ahead of everything else competing for the same slot, a majority has to be assembled, and a veto player has to decline to use the veto. Those costs are friction, and they accumulate the further along the process you go.
Friction does not simply slow change down; it changes the shape of it. Where friction is low, attention tracks the signal more or less proportionally, and period-to-period change looks roughly normal. Where friction is high, pressure builds against the cost of acting until it overcomes it, and then the response arrives all at once. So the same underlying signal produces long stretches of almost nothing punctuated by lurches — a distribution with a far taller peak and much fatter tails than a bell curve.
This is the claim that makes the domains a sequence rather than a list. Read left to right, the series below run from the least costly venue to the most: press coverage and public attention, then hearings, bills and platforms, then rulings and dollars. The prediction is that the punctuation gets sharper at every step — and it is testable in exactly these files. The agenda trends tool sets eight of them side by side on one topic system, so the sequence can be read as a measurement rather than taken on trust.
Inputs
Signals arriving at the political system — what the press covers, which social groups appear in that coverage, what the public searches for and names as the country's most important problem. Friction is lowest here: attention shifts continuously, in proportion to the signal.
Media
The media agenda since 1946 — front pages, index samples, and television news, all coded with the same topic system. The domain this site's own media data set will extend with continuous, AI-classified coverage.
Explore →New York Times
The paper of record as an agenda measure — the front page, the index sample, and the weights that make them representative.
Explore →Social groups
Attention to, and representation of, social groups in US coverage — this site's second data build.
Explore →Public attention (Trends)
Google Trends search interest as a public-attention measure across policy topics — this site's third data build.
Explore →Most Important Problem
Gallup has asked Americans the same question since the 1940s: what is the most important problem facing the country? The MIP series codes every answer into the Policy Agendas topic system — the longest-running measure of the public's agenda.
Explore →Agenda & processing
Where institutions take those signals up — party platforms, congressional hearings and bills, the presidential agenda. Friction rises: issues now compete for scarce institutional attention, and most of them lose.
Parties
What the parties promise: both platforms coded statement by statement since 1948.
Explore →Legislative
Congress at work: every bill, hearing, public law, and roll-call vote, topic-coded across seven decades.
Explore →Executive
The presidential agenda: State of the Union addresses coded quasi-sentence by quasi-sentence, executive orders, and veto rhetoric.
Explore →Outputs & outcomes
Authoritative decisions and the resources behind them — Supreme Court rulings and the federal budget. Friction is highest: change arrives late and, when it arrives, it arrives in lurches.
Judiciary
The Supreme Court's agenda, case by case, across the twentieth century and beyond.
Explore →Budget
Where the money actually goes: budget authority by function back to 1947 (with outlays reconstructed to 1791), adjusted for inflation and crosswalked to the Policy Agendas topic system.
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