kalshiJune 6, 202620d agoKaren Bass vs. Spencer Pratt in 2026 LA Mayoral Primary
Will Karen Bass and Spencer Pratt be the nominees in the 2026 Los Angeles mayoral primary?
Signal
NO TRADE
Probability
12%
Confidence
MEDIUM
75%
Summary.
The market is pricing a 7% probability that Karen Bass and Spencer Pratt will be the 2026 LA mayoral runoff nominees, implying 93% confidence that Nithya Raman will overtake Pratt for second place as late mail-in ballots are counted. My analysis estimates a 12% probability for the Bass-Pratt matchup—slightly less confident than the market that Raman will prevail. The June 2 primary has already occurred; Bass's advancement is certain (AP projection), and the question reduces to whether Pratt can hold his current 20,672-vote lead over Raman. While Pratt led by 8 points on election night, his advantage has eroded to 3 points as of June 6, with recent ballot batches showing Raman winning 33.5% vs Pratt's 20.2%. Historical California patterns show late mail-in ballots skew 5-10 points more progressive, and hundreds of thousands of ballots remain uncounted through June 9. Election experts and prediction markets (Kalshi gives Raman 82% to advance) strongly expect Raman to overtake Pratt within days. However, Pratt's 20,672-vote cushion is concrete, and the 7% market price may slightly underestimate the probability that remaining ballot composition differs from recent batches or that volumes are lower than estimated. Both market and analysis agree the most likely outcome is Bass vs Raman, with Pratt holding on representing the tail risk.
Reasoning.
This question has already been partially determined - the June 2, 2026 Los Angeles mayoral primary has occurred, and we are now in the vote-counting phase (today is June 6, 2026). This is fundamentally a question about which of two candidates (Spencer Pratt or Nithya Raman) will secure the second runoff spot alongside Karen Bass.
Current Vote Count Status (as of June 6, 2026):
- Karen Bass: 35% (AP has projected her advancement - essentially certain)
- Spencer Pratt: 28% (second place, +20,672 votes over Raman)
- Nithya Raman: 25% (third place, +3 percentage points behind)
Key Analytical Factors:
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Historical California Ballot Counting Patterns: Late-arriving mail-in ballots in California elections consistently skew 5-10 percentage points more progressive/Democratic than election-day totals. This is a well-established pattern.
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Recent Ballot Batch Trends: The most recent counted batches show Raman winning 33.5% vs Pratt's 20.2% - a 13.3 percentage point advantage. This is consistent with historical late-ballot patterns.
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Volume of Remaining Ballots: "Hundreds of thousands" of mail-in ballots remain uncounted with a 7-day acceptance window (through June 9). Given that Pratt's current lead is only 20,672 votes, there is substantial volume for Raman to overcome this deficit.
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Trajectory Analysis: Pratt's lead has already declined from 8 percentage points on election night to 3 percentage points as of June 6 - a clear, consistent erosion over 4 days of counting.
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Market Consensus: Both Polymarket (7-8%) and Kalshi (18% for Pratt advancing) indicate strong expectation that Raman will overtake Pratt.
Probability Estimate Logic:
The base rate suggests 70-80% probability that a progressive trailing by 3 points with hundreds of thousands of late mail ballots remaining will overtake their opponent. This implies a 20-30% chance Pratt holds on.
However, several factors warrant adjusting this estimate:
- The trend over June 4-6 has been remarkably consistent in Raman's favor
- Recent batches show Raman outperforming by 13+ points, exceeding typical late-ballot advantages
- Election data experts are confidently predicting Raman will overtake Pratt
- The volume of remaining ballots is substantial relative to the 20,672-vote gap
Counter-considerations:
- Pratt still holds a 20,672 raw vote lead - not trivial
- If remaining ballot composition differs from recent batches, the trend could slow
- Uncertainty in exact number of remaining ballots and their demographic composition
- Possible that early predictions underestimate Pratt's durability
Final Estimate: I estimate 12% probability that Bass and Pratt will be the nominees (meaning 88% probability that Bass and Raman will be the nominees).
This is slightly higher than the Polymarket consensus of 7-8% because:
- Pratt does still maintain a concrete 20,672-vote lead as of June 6
- While trends strongly favor Raman, vote counting can be non-linear
- Conservative adjustment for model uncertainty in this specific race
- The 18% Kalshi probability for Pratt advancing suggests some legitimate uncertainty remains
Key Factors.
Historical California pattern: late mail-in ballots skew 5-10 points more progressive than election-day results
Recent ballot batch performance: Raman winning 33.5% vs Pratt's 20.2% (13.3-point advantage)
Trajectory consistency: Pratt's lead has eroded from 8 points (election night) to 3 points (June 6) over 4 days
Volume of remaining ballots: hundreds of thousands uncounted vs. current 20,672-vote gap
Karen Bass advancement essentially certain (AP projection), so uncertainty is entirely Pratt vs Raman
Prediction market consensus strongly favors Raman (Polymarket 7-8% for Bass-Pratt, Kalshi 82% for Raman advancing)
7-day mail ballot acceptance window (through June 9) means substantial volume still incoming
Election data expert consensus expects Raman to overtake Pratt before counting concludes
Scenarios.
Raman Overtakes (Base Case)
88%Late mail-in ballots continue to favor Nithya Raman at rates similar to recent batches (33.5% Raman vs 20.2% Pratt). With hundreds of thousands of ballots remaining and a current deficit of only 20,672 votes, Raman closes the 3-point gap over the next 3-7 days and secures second place. Bass and Raman advance to the November runoff.
Trigger: Next ballot update (likely June 7-8) shows Raman continuing to gain 10+ percentage points on Pratt in new batches. County registrar reports indicate remaining uncounted ballots are disproportionately from progressive-leaning areas. Pratt's lead shrinks below 15,000 votes, then below 10,000, then Raman takes the lead before counting concludes by June 9-12.
Pratt Holds On (Bear Case for Market)
12%Spencer Pratt's 20,672-vote lead proves more durable than expected. Either: (1) the composition of remaining mail ballots is less progressive than recent batches, (2) Pratt's crossover appeal among Democrats is stronger in late-arriving ballots, or (3) the volume of remaining uncounted ballots is on the lower end of estimates. Pratt maintains narrow second-place finish, and Bass-Pratt advance to the runoff.
Trigger: June 7-8 ballot updates show Raman's gains slowing - she outperforms Pratt by only 5-7 points instead of 13+ points. County registrar announces fewer remaining ballots than initially estimated. Pratt's lead stabilizes above 15,000 votes with declining number of ballots left to count. Final certification shows Pratt finishing in second place by 5,000-10,000 votes.
Risks.
Remaining ballot composition could differ from recent batches counted on June 4-6, slowing Raman's gains
Actual volume of remaining uncounted ballots may be on lower end of 'hundreds of thousands' estimate
Pratt's crossover appeal (tough-on-crime message, Palisades Fire victim narrative) could perform better in late mail ballots than typical Republican/conservative candidates
Non-linear ballot counting: trends over 4 days may not extrapolate perfectly over final 3-7 days
Potential clerical errors, provisional ballot challenges, or other irregularities could alter final counts
Geographic clustering: if remaining ballots disproportionately come from Pratt-strong areas, trends could reverse
Current 20,672-vote lead is concrete and substantial - requires significant volume at current trend rates to overcome
Market may be overconfident: 7-8% implies ~92% certainty Raman overtakes, but some genuine uncertainty remains
Edge Assessment.
The market odds of 0.07 (7%) appear slightly too confident in Raman overtaking Pratt. My estimate of 0.12 (12%) suggests modest positive value in taking the "Yes" side of this bet (that Bass and Pratt will be the nominees).
However, this is a WEAK edge at best. The fundamental analysis strongly supports the market consensus:
- Historical patterns favor Raman
- Recent batch trends favor Raman
- Volume dynamics favor Raman
- Expert consensus expects Raman to win
The market at 7% is pricing in ~13:1 odds against Bass-Pratt. My 12% estimate implies ~7.3:1 odds against. This is not a compelling edge for several reasons:
- Information efficiency: Election prediction markets for ballot-counting scenarios tend to be highly efficient, incorporating real-time data faster than individual analysis
- Uncertainty magnitude: The difference between 7% and 12% is only 5 percentage points - within normal analytical uncertainty
- Directional confidence: Both the market and my analysis agree Raman is heavily favored (88-93% probability)
- Temporal decay: With ballot updates expected daily June 7-9, the situation will clarify rapidly, and any edge will disappear quickly
Recommendation: The market odds appear approximately fair. If forced to take a position, there is very slight value on "Yes" (Bass-Pratt advancing) at 7% odds, but this is not a high-conviction bet. The smart money consensus that Raman will overtake Pratt is well-founded and likely correct.
What Would Change Our Mind.
June 7-8 ballot updates show Raman's advantage shrinking to 5-7 points per batch instead of 13+ points, indicating slowing momentum
LA County Registrar announces total remaining uncounted ballots are significantly lower than 'hundreds of thousands' (e.g., under 150,000)
Geographic analysis reveals remaining ballots disproportionately from Pratt-strong neighborhoods or demographics
Pratt's lead stabilizes or grows in next update, reversing the consistent erosion trend observed June 4-6
Expert election analysts revise projections to indicate Pratt has >30% probability of holding second place
Kalshi/Polymarket probabilities for Pratt advancing rise above 25-30%, indicating smart money reassessment
Sources.
- Los Angeles 2026 Mayoral Primary Results - Official County Data
- AP Projects Karen Bass Advances; Second Place Remains Too Close to Call
- Late Mail-In Ballots Fuel Raman Surge in LA Mayor Race
- Polymarket: Will Karen Bass and Spencer Pratt be LA Mayor Nominees?
- Kalshi: LA Mayor Runoff Candidate Markets
- Spencer Pratt's Lead Evaporating as Late Ballots Counted
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