Election Tracker

A single-page tracker for US elections: the 2026 midterms as they were forecast, voted and counted, plus election history back to 1789.

Live site: https://tom-neverwinter.github.io/election-tracker/

Every badge above is live: site reachability, the GitHub Pages deployment, and repository activity as reported by GitHub. "Data updated" is the time of the last commit, which is normally the hourly data capture.

What's on the page

Tab	What it shows
President	2028 state and national market odds, and every presidential election since 1788
Senate, House, Governor	2026 forecasts (consensus of the published race ratings plus Polymarket odds), and past results by year
Results	Nov 3, 2026 results for Senate, House, Governor and other statewide races, plus each state's certification deadline
Timeline	Hour-by-hour captures of odds, projected seats, early votes and race calls
Early vote	Ballots cast before Election Day by state, per eligible voter and against 2022
Measures	Statewide ballot measures: 2026 with results, and past years
States	Party control of each state government and trifectas, 1776 to today
History	Turnout by state for any two elections from 1980 to 2024, and national turnout since 1789

Links are shareable: the address tracks the open tab and year, for example #president/1860. Add ?day=YYYY-MM-DD to open a saved daily snapshot of the forecasts.

How it works

There is no build step and no server. index.html is the whole app; it loads D3 and the data files below as plain scripts, so it runs from GitHub Pages or straight from disk.

• Live on open. data.js fetches forecast ratings from Wikipedia, odds from Polymarket and the early-vote feed in the visitor's browser. If that fails, the page falls back to the newest saved snapshot.
• Captured on a schedule. Results can't be fetched from the browser, so Node scripts write them into data files that are committed to this repo. hourly.js runs all of them, saves a capture to hourly/, and pushes.

Script	Writes	Source
snapshot.js	history.js (one forecast snapshot per day)	everything data.js loads
results.js	results-data.js	NBC News results (Associated Press vote data)
measures-results.js	measures-results-data.js	Wikipedia, 2026 United States ballot measures
legislature-results.js	legislature-results-data.js	Wikipedia, 2026 state legislative elections
hourly-index.js	hourly/index.js (compact summary of every capture)	hourly/*.json
hourly.js	runs all of the above, then commits and pushes

Static data lives in past/ (president, Senate, House, governor, turnout, state control, ballot measures), measures.js and certification.js.

Run it yourself

Open index.html in a browser. Nothing to install.

To refresh the captured data you need Node 18 or newer (the scripts use the built-in fetch; there are no dependencies):

node snapshot.js   # save today's forecasts
node results.js    # pull current results
node hourly.js     # run everything, save an hourly capture, commit and push

Hand-maintained data

A few things have no reliable feed and are edited by hand:

• Early-vote corrections in data.js, for states where the feed lags official or news-reported totals. Each carries its source and shows on the page as hand-entered.
• Certified dates in certification.js. The page shows each state's legal deadline; a state is marked "Certified" only when its certified date is filled in.
• Ballot-measure summaries in measures.js, written for this site.

Sources

• Race ratings: Wikipedia's 2026 Senate, House and gubernatorial ratings tables
• Market odds: Polymarket
• Results: NBC News, with vote data from the Associated Press
• Early vote: Who Shows Up, plus state election offices for corrections
• Past results: MIT Election Lab, Voteview, Wikipedia
• Turnout: UF Election Lab
• Certification deadlines: USAFacts, compiled from NCSL and state election offices
• Population and eligible voters: US Census Bureau

Caveats

This is a personal project, not an official source. Race calls are media projections until a state certifies. The "consensus" rating is a simple average of published ratings and market odds, not a model. Market odds for 2028 are thinly traded.