Wisconsin Democratic Primary Delayed by Mislabeled Flash Drives

A technical error involving mislabeled flash drives delayed the final results of Wisconsin's Democratic gubernatorial primary late Tuesday night, leading to a stunning upset and a memorable on-air moment for NBC News analyst Steve Kornacki. Milwaukee County Executive David Crowley defeated State Representative Francesca Hong in a race that was much closer than pre-election polls had suggested.

The Associated Press called the race for Crowley at 2:34 a.m. Wednesday after Hong conceded. With nearly all votes counted, Crowley captured 39.8 percent of the vote, or 313,321 votes, to Hong's 39.4 percent, or 310,109 votes, a margin of roughly 3,200 votes. State Senator Kelda Roys finished third with 7.5 percent.

The delay occurred when five of nine flash drives containing results from Milwaukee's central count facility were found to have audit logs downloaded instead of the election results. Milwaukee County officials announced the error, which stalled the reporting process and forced election workers to retrieve the correct data. The head of Milwaukee's elections office confirmed the mistake was a case of someone pressing the wrong button.

The development unfolded live on NBC News'...