California governor would be far and away the most notable top-two primary lockout ever

Statewide or congressional top-two primaries where one major party failed to advance a candidate in a seat that leaned toward the party or was competitive, and how California's 2026 race for governor would compare

The lean is based on the margin in the state or district in the last presidential election compared with the nation as a whole. For instance, California voted Democratic by 20.1 percentage points in 2024 while President Donald Trump led in the national popular vote by about 1.5 points. That gave the state a lean of D+21.6 or D+22 rounded.