The Commonwealth Explorer

Switch layers, jump to major regions, and compare contests without leaving the map.

Fly to

Jump to counties, districts, or precincts without changing the selected contest.

Viewing precincts...

Contest

Start here: pick a contest, then click a county or district for the full story. Shortcuts: `P` precincts, `L` labels, `C` copy link.

Current map Margins

Choose a contest

Counties No contest selected

Statewide snapshot

Choose a contest

Keeps the statewide race call visible while you browse counties, districts, and trend history.

Live summary

Select a contest to see the statewide leader, vote split, and competitiveness.

Quick Jumps

Map Layer

Analysis Mode

What-if and overlays Simple swing controls and map overlays

Scope

What-if swing 0.0%

Direct shift for quick what-if testing. Positive is more Democratic, negative is more Republican.

Overlay

Turnout intensity opacity (bivariate) High contrast demographics

Positive swing shifts margins toward Democrats. Negative values shift toward Republicans. Modeled 2026 Senate and Court entries inherit this swing.

Advanced analytics Realignment index and ghost precinct tracker

Realignment Index

Select a contest to load top shifting precincts.

Ghost Precinct Tracker

Waiting for contest selection.

Map key

Two-party margin buckets for the selected contest.

Margins

Republican Annihilation Tossup Democratic Annihilation

R +40 R +10 R +1 Tie D +1 D +10 D +40

Annihilation 40+ Dominant 30+ Stronghold 20+ Safe 10+ Likely 5.5+ Lean 1+ Tilt 0.5+ Tossup <0.5

Barometer