Time Publishes a Projection That 2026 Gerrymandering Hits 45 on a Newly-Created Index, Driven Entirely by New Maps

Time published on May 29, 2026 a projection that the 2026 election cycle will produce a Gerrymandering Partisan Index (GPI) of 45, a 30% jump that the article says is “driven entirely by new maps rather than any change in voter behavior” and “the largest one-cycle move in the modern record.”

Read the measurement before the number. The GPI is not an established academic index. It was created by Bruce Sibley, the article’s own author, and is published in the same piece that reports its result. It “counts seats won by the majority party beyond what closest-to-proportional rounding would award, summed across all states and expressed as a share of the maximum possible for each cycle on a 0-to-100 scale.” The baseline is a 1976–2008 average of 13.

This entry records the claim with that provenance attached, because the provenance is the qualification. A single-author index introduced alongside its own headline finding is a hypothesis with a number on it, not a measurement the field has tested. It is not the efficiency gap, the declination, or any of the metrics with a litigation and peer-review history behind them. The direction it reports is corroborated by the rest of this timeline — the point is that its magnitude carries only the authority of its author.

What the index does capture cleanly is the mechanism. Sibley’s construction isolates map-drawing from voter behavior by design: it measures seats relative to proportional rounding, so a change in the index cannot be produced by voters changing their minds. If the underlying seat counts are right, “driven entirely by new maps” is what the construction is built to detect, and that is a narrower and more defensible claim than the aggregate score.

The surrounding record is independently documented here: the Callais decision gutting VRA Section 2 and reworking the Gingles standard (April 29) with its immediate-effect order (May 4), six Republican states scheduling August special sessions for post-VRA redistricting, mid-decade redraw efforts meeting setbacks in Alabama and South Carolina (May 26), and California’s own defensive redistricting. On the last of those, the article adds a specific: Proposition 50, championed by Governor Gavin Newsom, suspended California’s independent redistricting commission for one cycle to allow a counter-gerrymander.

That detail is worth holding without flattening it. A state dismantling its own anti-gerrymandering institution to gerrymander in response is not equivalent to the redraws that prompted it, and it is also not nothing: the commission was the thing that made California’s maps not subject to this fight, and it was suspended by referendum rather than seized.

Sourcing note. The GPI figure of 45, the 30% jump, the 1976–2008 baseline of 13, the index’s definition, the “largest one-cycle move” phrasing, and the Proposition 50 detail are all from the Time article, read directly for this entry. Per corpus discipline on inherited counts, the important finding here is the one the capture ledger’s own fact-check asked for: the methodology was checked, and it resolves to a measure created by the author of the piece reporting it. The number should be cited as “an index created by Time’s author projects,” never as “gerrymandering rose 30%.” The 2026 figure is a projection, not a result — the cycle had not occurred. The capture ledger bundled the Callais holding into this story; that material is not carried here, as it is already recorded at 2026-04-29 and 2026-05-04 with its own sourcing, and the ledger’s third source was flagged by its own fact-check as indirect and has been dropped.