Kalshi market restores El-Sayed’s Michigan Senate advantage after debate dip

Kalshi’s market for Michigan’s open U.S. Senate seat put Democrat Abdul El-Sayed’s implied chance of winning at 69% on Oct. 15, compared with 31% for Republican Mike Rogers. The price had recovered from a low of 66% in the days after the candidates’ first debate, though it remained below El-Sayed’s 72% pre-debate level.

The earlier market reaction was sharper. On Oct. 9, El-Sayed’s implied chance fell from 73% to 67% after the Grand Rapids debate, while Rogers rose from 27% to 33%. The encounter was marked by personal attacks, interruptions and arguments that continued through a commercial break, according to PBS NewsHour.

Market pricing continues to show a wider El-Sayed advantage than recent polling. The FiftyPlusOne average had El-Sayed at 48.2% and Rogers at 44.7%, while an InsiderAdvantage poll put the contest at 48% to 46%. A RealClearPolling.com average published Oct. 12 showed a 48.1% to 45% lead for El-Sayed, a 3.1-point margin within the typical 3-to-5-point margin of error cited for political polls.

El-Sayed led 11 of the 12 Michigan polls included in that RealClearPolling average since Sept. 15; Rogers led none, and his best result was a tie. Most polls released after the end of September put El-Sayed ahead by one or two points, underscoring the gap between the prediction-market assessment and a close polling race.

The contest is for the seat being vacated by Democratic Senator Gary Peters and is viewed by both parties as important to Senate control. Kalshi traders gave Democrats a 62% implied chance of controlling the Senate, against 38% for Republicans, up from 61% for Democrats in the immediate aftermath of the debate.

Campaign activity and advertising have intensified. Michigan Senate advertising spending had reached $181 million, making it the fourth-largest total among Senate races and the seventh-largest on a per-capita basis. Republicans had spent $105 million in support of Rogers and Democrats $76 million backing El-Sayed.

El-Sayed made stops in Escanaba, Iron Mountain and Marquette in Upper Michigan during the week before Oct. 15, appearing with New York Representative Alexandria Ocasio-Cortez while seeking support in a traditionally Republican-leaning region.