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T-minus 16 days

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● House // Race file

[ House // CA-21 ]

California's 21st District

Jim Costa (D)vsKyle Kirkland (R)

incumbent running · Lean: D+5 · Incumbent: Jim Costa (D)

99 in 100

Jim Costa favored>99%

All but certain for Jim Costa: a 100 percent chance of winning. No public polls yet.

  • Seat:Incumbent running
  • Lean:D+5
  • Incumbent:Jim Costa (D)
  • District:21 of 52 in California
  • Odds:Costa >99%
  • Margin:Costa +23.4, give or take 6.2
  • Polls:none yet, running on the fundamentals
  • Generic ballot:D+8.2
  • T-minus:16 days

▸ Margin // Uncertainty

Costa +23.4

The model's best guess at the final margin, give or take 6.2 points. Polls have missed by more than that before.

Projected margin
Costa +23.4
Uncertainty
6.2 points, one standard deviation
Likely range
Costa +15.5 to Costa +31.3 (80 percent)
Poll average
No polls
Starting point
Costa +23.4 before any polls

Margins read Democrat minus Republican: Costa ahead is positive, Kirkland ahead is negative.

▸ Movement // 0 daily snapshots

Reading the history

▸ Polls // None yet

No public polls here. The number comes from the district lean (D+5, worth 8.7 points to the Democrat), the incumbent (Jim Costa, running again, worth 4.8 points), and the national environment (generic ballot D+8.2, which the model reads as a 9.9 point Democratic tilt after discounting it). Together they give a projected margin of Costa +23.4 with an uncertainty of 6.2 points.

▸ Race file // The facts

The seat
Jim Costa (D), running for another term.
On the ballot
Jim Costa (D, incumbent) vs Kyle Kirkland (R)
Last time
2024: Democrat 52.6, Republican 47.4. Costa by 5.2.
President
2024, statewide: Trump 38.3, Harris 58.5. Harris by 20.1.
Lean
D+5 by the Cook partisan index

Facts from Ballotpedia and Wikipedia, in our words. The district on Ballotpedia ↗

▸ Candidates // Read more

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