For several weeks before New York City’s 2025 Democratic mayoral primary, I would track the New York Times' Latest Polls tab as poll after poll came in, each suggesting that Mamdani had gained momentum but was still far behind Cuomo. Yet as I analyzed the polling data, something felt off. Pollsters selected random participants using weighted averages based on age groups (among other factors), but determined these age groups using data from the previous election, assuming that turnout for 18- to 29-year-olds would stay as low as it had been in 2021. I, along with many others on the left, believed that Mamdani's surging popularity among younger New Yorkers could dramatically shift turnout in the state—a possibility no poll was really factoring in.
Mamdani would go on to win the primary by a significantly larger margin than any poll had predicted: 56.4% to 43.6%. Polls predicted that 18- to 29-year-olds would make up around 10.8% of the electorate, the official rate reported by the New York City Campaign Finance Board for the 2021 mayoral election. However, my own analysis of data from the 2025 primaries* shows that 18- to 29-year-olds made up around 19.3% of the electorate, nearly double the expected rate. This discrepancy in expected young voter turnout limited the accuracy of even the most reputable pollsters, making me realize I wanted a way to analyze poll results while accounting for these possible discrepancies.
The data is already there—people in different communities tell pollsters who they plan to vote for. That data, typically, is transformed into a few clean numbers: support for the Democratic candidate, support for the Republican candidate, and undecided voters. While I will also provide an aggregate tracker based on these figures, my broader goal is to compile polling data that can provide a more comprehensive understanding of what that data means.
While I will make my own predictions, my focus will be on providing context to the polls found on the New York Times poll tracker. Because I am only one person, I will be focusing on three key races in 2026, but will include a simpler tracker for other important races.
*I used data from the New York City Campaign Finance Board to estimate the share of the electorate who were between the ages of 18 and 29. See the full report here. To understand how I developed my own estimate based on this data, click here.