Election Day is upon us. Michigan’s Senate race is pivotal in determining control of the chamber, and the market saw massive movement over the weekend after former Democratic candidate Haley Stevens endorsed Republican nominee Mike Rogers over Abdul El-Sayed. The move not only triggered massive backlash within the Democratic Party, but also ignited a wave of extreme volatility on Polymarket.
Before we break down the Michigan Senate odds heading into Election Day, make sure to grab our Polymarket promo code and download the Action Network app to get the best political trading insights.
Haley Stevens Endorses Mike Rogers Two Days Before Election Day
In one of the most unexpected twists of the midterm cycle, Michigan Democratic Congresswoman Haley Stevens, who lost her party’s August primary, announced Sunday that she is endorsing Republican nominee Mike Rogers in his Senate race against Democrat Abdul El-Sayed.
Despite a bitter primary battle, Stevens had previously promised to support El-Sayed and affirmed as recently as Wednesday that she still wanted him to win. Her ultimate endorsement sent shockwaves through Michigan Democratic circles. When questioned about the abrupt reversal, she simply replied, "I changed my mind."
Stevens and El-Sayed have clashed sharply in the past over foreign policy and domestic fallout, including U.S. support for Israel, the broader conflict involving Iran, and their cascading economic impacts.
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El-Sayed’s Odds Fell From About 82% to 70% After the Endorsement
The surprise endorsement sent immediate shockwaves through the prediction markets. On Sunday, Abdul El-Sayed’s odds tumbled from 82% to 70%, marking the steepest single-day drop his contract has suffered in weeks. However, the Democratic nominee had a massive rebound, finding his way back to an 80% implied probability in under 24 hours.
By contrast, Mike Rogers experienced his sharpest surge in weeks, climbing from 20% to 30%. But as his rival quickly regained his footing on the boards, Rogers slipped back into heavy underdog territory despite the high-profile backing of his former primary opponent, Haley Stevens.
These wild swings underscore El-Sayed’s resilience as a candidate, as well as Polymarket traders' confidence in his ability to capture one of the most pivotal Senate seats of the entire midterm cycle.
Democrats Close Ranks: Schumer, Jeffries and Harris Back El-Sayed
Stevens’ remarks were widely viewed as a betrayal and a personal retaliation against the Democratic nominee who defeated her in the primary. In response, Democrats across the party’s ideological spectrum have rallied behind Abdul El-Sayed, one of the party’s best-positioned candidates to flip a pivotal Senate seat that remains crucial to the future balance of power.
Although Stevens claims that numerous Democrats have privately reached out to support her move, the public response from her party was overwhelmingly negative. Senate Minority Leader Chuck Schumer, who was a quiet ally of Stevens during her primary race against El-Sayed, publicly denounced her action, labeling it "a despicable betrayal from Rep. Stevens".
Schumer concluded that “Democrats are united in our support for Abdul El-Sayed because we know he will fight for the economic interests of working families in Michigan, unlike Mike Rogers, who is a tool of Donald Trump and billionaire donors.”
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Latest Michigan Senate Polls: El-Sayed Leads in 11 of 12 October Surveys
Polling paints a grim picture for the Republican nominee. Across 11 of the last 12 surveys conducted on Michigan’s Senate race, Abdul El-Sayed has emerged on top. In fact, in the most recent poll conducted by The New York Times, the Democratic nominee led Mike Rogers by 11 percentage points. and that is just the tip of the iceberg.
Throughout recent polling, El-Sayed’s lead over Rogers has ranged between two and 11 percentage points, including a Michigan State University survey showing the Democrat ahead by nine points.
The numbers are clear and reinforce what prediction markets are projecting: Democrats hold strong odds of locking down a pivotal Senate seat tomorrow.
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Final-day Checklist: What to Check Before Trading Michigan’s Race
The volatility sparked by Stevens’ endorsement of Rogers proved fleeting. While the board saw 24 hours of shifting odds, prediction markets have now stabilized around levels seen prior to the former Democratic candidate’s announcement.
The sentiment backing El-Sayed is too pronounced to fade. Polling reinforces this projection, pointing to an increasingly comfortable margin of victory. At this stage, backing the Democratic nominee appears to be the best play.
This also has major implications for markets tied to Senate control and the balance of power for the remainder of Donald Trump’s presidency. As a must-win Senate seat for Democrats in their push to reclaim the majority, the shifting odds in Michigan could send ripples through broader midterm markets.
