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Wisconsin Gov. Tony Evers (D) listens to Milwaukee County Executive David Crowley at a rally just before Tuesday's primary. Photo: Scott Olson/Getty Images

Pollsters appeared to blow another high-stakes Midwest election Tuesday, as center-left Democrat David Crowley stunned socialist Francesca Hong in Wisconsin's primary for governor.

Driving the news: Two polls had shown Hong up by about 20 points over Crowley. But Crowley wound up winning by half a percentage point in an upset that interrupted a run of primary wins by left-wing Democrats this spring.