Democrats looking at favorable Senate polling across the Midwest may want to keep the champagne corked for a while longer.
CNN chief data analyst Harry Enten issued a significant warning Wednesday about Democratic advantages currently showing up in Iowa, Ohio and Michigan. His point was not that Republicans are guaranteed to win those races. It was considerably simpler: recent election history shows Republicans repeatedly performing better on Election Day than September polling suggested.
“We’ve had really good Democratic polls coming out from Ohio, Michigan, Iowa,” Enten said on CNN News Central. “And, you know, fool me once, shame on you. Fool me four times, I just have to ask the question, could it happen again?”
The numbers explain why he is asking.
In major statewide races during the 2024 election, Republicans outperformed their September polling by nine percentage points in Iowa, six points in Ohio and five points in Michigan. According to Enten, the current Democratic polling advantages in those states are smaller than those previous polling misses.
In other words, the polls can look pretty until actual voters start ruining everyone’s spreadsheet.
There is an obvious objection: President Trump was on the ballot in 2024, and his political coalition has historically proved difficult for pollsters to measure accurately.
Enten anticipated that argument and went back to 2018, President Trump’s first midterm election, when he wasn’t personally on the ballot.
Republicans still exceeded their September polling by six points in Iowa, six points in Ohio and eight points in Michigan. Enten noted that across the 2016, 2018, 2020 and 2024 cycles, Republicans outperformed September polling by at least five points in all three states.
That history doesn’t establish what will happen in 2026. Polling methodologies change, electorates change and individual candidates matter. But it does illustrate why treating today’s Democratic advantages as guaranteed November outcomes would be premature.
The implications for Senate control could be substantial.
Enten demonstrated a hypothetical map in which Republicans outperform their current Midwest polling enough to win Michigan, Ohio and Iowa. Under that scenario, Democrats could still win Texas, Georgia, North Carolina and Alaska and the Senate would finish tied 50-50.
Vice President JD Vance would then cast tie-breaking votes, leaving Republicans with effective control of the chamber.
That’s quite a difference from simply looking at current polling and declaring the Senate decided.
Only days earlier, Enten had explained that if September’s polling translated directly into election results, Democrats would emerge with 53 Senate seats. But even during that analysis, he emphasized that September polls are not perfect.
His latest segment provides the historical warning label.
None of this means Republicans will automatically receive another five-to-nine-point polling boost. Past polling errors are not guaranteed to repeat themselves, and they shouldn’t simply be added mechanically to today’s numbers as though November were an algebra problem.
What the data demonstrates is uncertainty.
Democrats currently have reasons for optimism in several crucial Senate contests. Republicans have reasons to remember what happened the last several times September polling in these same Midwestern states appeared less favorable than the eventual results.
As CNN anchor John Berman neatly summarized it, “September is not November.”
Sources: CNN News Central transcript, September 30, 2026; RealClearPolitics, September 30, 2026.
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