The 2004 Wisconsin primary took place on February 17, 2004 as part of the 2004 United States Democratic presidential primaries. The delegate allocation is Proportional. The candidates are awarded delegates in proportion to the percentage of votes received and is open to registered Democrats only. A total of 72 (of 87) delegates are awarded proportionally. A 15 percent threshold is required to receive delegates. John Kerry won the primary with John Edwards coming in second.
Although Kerry was gaining momentum, he won Wisconsin with just 39.6% of the vote and won with a margin of slightly over 5%. Edwards did very well in the state, winning several counties and even won Wisconsin's 5th congressional district. Edwards reached 40% in 5 counties, and Kerry did win a majority of the counties in the state. One of Kerry's keys to victory was winning the heavily populated and the county with the highest turnout, Milwaukee County, with 40% of the vote.