Vermont senator Bernie Sanders won the contest with 56.5%, distancing nationwide frontrunner Hillary Clinton by 13 percentage points.

The two parties' primaries were held in conjunction with this year's Wisconsin judicial elections, where Wisconsin Supreme Court justice Rebecca Bradley was confirmed for a 10-year elected term, winning over Appeals Court judge JoAnne Kloppenburg.

[3] Liberals made up two-thirds of the majority-white primary electorate, and the economy, followed by income inequality, were of top concern to voters, according to exit polls.

[3] Clinton lost Wisconsin by a narrow margin of 0.77% in the general election, against Republican nominee Donald Trump.

He carried the major cities of Madison, which has a younger electorate, as well as Eau Claire, Green Bay, Oshkosh, and Kenosha.