Two credible signals describe the 2028 Democratic field, and they disagree. Most national primary surveys in July 2026 put Kamala Harris first by a wide margin, with Pete Buttigieg inside the top three. Both Kalshi and Polymarket agree with an inverted read, pricing Gavin Newsom first near 20 cents, Alexandria Ocasio-Cortez and Jon Ossoff around 14 to 15 cents, Harris fourth in the single digits, and Buttigieg sixth near 5 cents.
The fair values below are independent analyst estimates, derived from base rates and current evidence, and compared to prediction markets, roughly two years before the nomination is settled.
2028 Democratic Presidential Nomination Odds
Here are the latest live odds over at Kalshi and Polymarket for the DNC's favored candidates.
The Polls and prediction markets disagree on the 2028 Democratic nominee field. The Pollsmax national primary average puts Kamala Harris first by 16 points, with Gavin Newsom and Pete Buttigieg inside the top three. Kalshi and Polymarket agree on a very different top three and split only on its order, with Polymarket pricing Alexandria Ocasio-Cortez as the frontrunner at 19 cents and Jon Ossoff 2nd at 16, and Kalshi pricing Ossoff first at 17 and Ocasio-Cortez at 15, followed on both by Newsom at 14, Harris at 8, and Buttigieg at 5 to 6.
The candidate fair values below are independent analyst estimates, derived from base rates and current evidence, and compared to prediction markets, roughly 16 months before South Carolina opens the primary on January 22, 2028, under the calendar the DNC ratified in August 2026.
Alexandria Ocasio-Cortez – Polymarket 19 cents – Kalshi 15 cents – Fair value 12%.
The most committed base in the field and Polymarket's favorite, after telling ABC on August 9 that she has not ruled out running and leading a University of New Hampshire poll at 22%. The case against paying 19 cents is structural, since the Democratic left won New Hampshire in both 2016 and 2020 before the party consolidated against Bernie Sanders in South Carolina, the state that now votes first. She probably runs (0.70) and wins the nomination about one in six times if she does (0.17). That is 0.70 × 0.17, or 12%, so Polymarket pays a seven-point momentum premium and Kalshi a three-point one.
Jon Ossoff – Polymarket 16 cents – Kalshi 17 cents – Fair value 6%.
The clearest mispricing on either market, and Kalshi's outright favorite. He must first win his 2026 Georgia Senate race, which he is favored to do (0.78), he told CNN on June 28 that he has no interest in a 2028 run and so is unlikely to pivot even if he wins (0.25), and he draws 7.7% in the national average, a live nominee perhaps one in three times if he ran (0.33). Gating those steps, 0.78 × 0.25 × 0.33 yields 6%. The market is long roughly 10 to 11 points on headlines and narrative.
Gavin Newsom – Polymarket 14 cents – Kalshi 14 cents – Fair value 16%.
Down from the mid-30s in January. The current California Governor is term-limited in January 2027 and told CNN on September 7 that he would be lying if he denied that 2028 was a factor in his fourth South Carolina visit this year. He almost certainly runs (0.90) and wins a little better than one in six times if he does (0.18). That is 0.90 × 0.18, or 16%. The price no longer buys a favorite, and it sits two points under fair value.
Kamala Harris – Polymarket 8 cents – Kalshi 8 cents – Fair value 9%.
Harris is discounted by the markets and credited by the polls. She leads the national average at 30.9%, and the most recent Harvard/HarrisX poll, released August 30, has her at 42%, yet parties rarely renominate a defeated nominee (about 15% of the time), and Politico reported in early September that red-state Democrats would rather she not campaign for them. She commits about half the time (0.55) and wins roughly one in six times if she does (0.16). That is 0.55 × 0.16, or 9%. The polls are likely measuring recognition, while the prices reflect a high degree of skepticism.
Pete Buttigieg – Polymarket 6 cents – Kalshi 5 cents – Fair value 9%.
The most underpriced conventional contender. He said on August 3 that he is "more inclined than not" to run (0.85), and sits third nationally and second in New Hampshire. But he took 8% in South Carolina in 2020, and that state now votes first, so he wins about one in ten times if he runs (0.10). That is 0.85 × 0.10, or 9%.
Bottom line
Ocasio-Cortez and Ossoff, one uncommitted and one on record declining, together carry 35 cents on Polymarket and 32 on Kalshi; Harris and Buttigieg, who lead the polling and are each considering it, carry 14 on both. Both markets discount name-recognition candidates and pay a premium for narrative. Consolidated fair value runs Newsom 16%, Ocasio-Cortez 12%, Harris 9%, Buttigieg 9%, and Ossoff 6%. The most-supported position is to fade Ossoff.
