Polling inaccuracies in the recent Democratic primaries in Wisconsin and Michigan have highlighted various challenges faced by the polling industry, including late-deciding voters and unexpected turnout. In Wisconsin, State Rep. Francesca Hong was favored to win the gubernatorial primary by approximately 20 percentage points, but Milwaukee County Executive David Crowley won by less than half a percentage point. In Michigan, Abdul el Sayed narrowly defeated Rep. Haley Stevens by about 1 percentage point, despite polls indicating a double-digit lead for el Sayed.
Pollsters attribute these discrepancies to several factors, including high turnout, late-deciding voters, and difficulties in reaching certain voter demographics. Democratic pollster Adam Carlson noted that while polling was off, it is not fundamentally broken. In Wisconsin, a significant portion of voters remained undecided, and Crowley was able to consolidate support from undecided voters in the final weeks of the campaign. In Michigan, pollsters struggled to accurately represent the electorate, particularly among rural and low-engagement voters.
The broader implications for future elections, particularly the 2028 Democratic presidential primary, raise concerns about the ability of polls to accurately capture voter sentiment as preferences may remain fluid until close to the election. Pollsters acknowledge the need to adapt their methods to improve accuracy in future elections.